{"id":21783,"date":"2025-07-08T21:45:52","date_gmt":"2025-07-08T14:45:52","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=21783"},"modified":"2025-07-10T05:35:04","modified_gmt":"2025-07-09T22:35:04","slug":"tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/","title":{"rendered":"T\u1ea5t t\u1ea7n t\u1eadt c\u00e1c d\u1ea1ng to\u00e1n l\u1edbp 2 ph\u00e9p c\u1ed9ng t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Khai_niem_ve_cac_so_co_ban_ngoai_ra\" >Kh\u00e1i ni\u1ec7m v\u1ec1 c\u00e1c s\u1ed1 c\u01a1 b\u1ea3n ngo\u00e0i ra<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Tinh_toan_chung_lop_2_chung\" >T\u00ednh to\u00e1n chung l\u1edbp 2 chung<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Mau_1_Doc_viet_so_sanh_cac_so_trong_vong_100\" >M\u1eabu 1: \u0110\u1ecdc, vi\u1ebft, so s\u00e1nh c\u00e1c s\u1ed1 trong v\u00f2ng 100<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_1_Viet\" >B\u00e0i t\u1eadp 1: Vi\u1ebft<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_2_Tim\" >B\u00e0i t\u1eadp 2: T\u00ecm<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_3_Dien_vao_so_thich_hop_trong_trong\" >B\u00e0i t\u1eadp 3: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong tr\u1ed1ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_4_Sap_xep_cac_so_sau_15_38_96_74_42_59\" >B\u00e0i t\u1eadp 4: S\u1eafp x\u1ebfp c\u00e1c s\u1ed1 sau: 15, 38, 96, 74, 42, 59<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_5_Tim_x\" >B\u00e0i t\u1eadp 5: T\u00ecm x<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Mau_2_Them_tru_va_nho_trong_vong_100\" >M\u1eabu 2: Th\u00eam, tr\u1eeb v\u00e0 nh\u1edb trong v\u00f2ng 100<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_1_Ket_noi_ket_qua_voi_tinh_toan\" >B\u00e0i t\u1eadp 1: K\u1ebft n\u1ed1i k\u1ebft qu\u1ea3 v\u1edbi t\u00ednh to\u00e1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_2_Ket_noi_2_Ket_qua_bang_nhau\" >B\u00e0i t\u1eadp 2: K\u1ebft n\u1ed1i 2 K\u1ebft qu\u1ea3 b\u1eb1ng nhau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_3_Dien_vao_so_thich_hop_trong_trong-2\" >B\u00e0i t\u1eadp 3: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong tr\u1ed1ng<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Mau_3_Tam_ly_tinh_toan_nhanh\" >M\u1eabu 3: T\u00e2m l\u00fd, t\u00ednh to\u00e1n nhanh<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_1_Vui_long_tinh_toan_cac_tinh_toan_sau\" >B\u00e0i t\u1eadp 1: Vui l\u00f2ng t\u00ednh to\u00e1n c\u00e1c t\u00ednh to\u00e1n sau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_2_Tinh_toan_theo_bieu_mau\" >B\u00e0i t\u1eadp 2: T\u00ednh to\u00e1n (theo bi\u1ec3u m\u1eabu)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Mau_4_Tim_thanh_phan_tinh_toan_chua_biet\" >M\u1eabu 4: T\u00ecm th\u00e0nh ph\u1ea7n t\u00ednh to\u00e1n ch\u01b0a bi\u1ebft<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_1_Dien_vao_so_thich_hop_trong_hop\" >B\u00e0i t\u1eadp 1: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong h\u1ed9p<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_2_Tim_x\" >B\u00e0i t\u1eadp 2: T\u00ecm x<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Bai_tap_3_Giai_quyet_cac_van_de_sau\" >B\u00e0i t\u1eadp 3: Gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 sau<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Huong_dan_ve_cach_day_tre_em_nhanh_chong_tinh_toan\" >H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch d\u1ea1y tr\u1ebb em nhanh ch\u00f3ng t\u00ednh to\u00e1n<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Ap_dung_mot_tuyen_duong_5_de_day_tre_em_nhanh_chong\" >\u00c1p d\u1ee5ng m\u1ed9t tuy\u1ebfn \u0111\u01b0\u1eddng 5 \u0111\u1ec3 d\u1ea1y tr\u1ebb em nhanh ch\u00f3ng<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Buoc_1_Giup_tre_em_yeu_thich_va_hieu_them_ve_cac_con_so\" >B\u01b0\u1edbc 1: Gi\u00fap tr\u1ebb em y\u00eau th\u00edch v\u00e0 hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c con s\u1ed1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Buoc_2_Day_tre_cach_dem_so\" >B\u01b0\u1edbc 2: D\u1ea1y tr\u1ebb c\u00e1ch \u0111\u1ebfm s\u1ed1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Buoc_3_Su_dung_cac_mat_hang_ho_tro_cho_tre_em\" >B\u01b0\u1edbc 3: S\u1eed d\u1ee5ng c\u00e1c m\u1eb7t h\u00e0ng h\u1ed7 tr\u1ee3 cho tr\u1ebb em<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Buoc_4_Tim_hieu_%E2%80%93_Choi\" >B\u01b0\u1edbc 4: T\u00ecm hi\u1ec3u &#8211; Ch\u01a1i<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Buoc_5_Thay_doi_hinh_thuc_hoc_tap\" >B\u01b0\u1edbc 5: Thay \u0111\u1ed5i h\u00ecnh th\u1ee9c h\u1ecdc t\u1eadp<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.ckconitsha.com\/vn\/tat-tan-tat-cac-dang-toan-lop-2-phep-cong-tu-co-ban-den-nang-cao\/#Mot_so_meo_de_tinh_toan_bo_sung_hieu_qua_nhat\" >M\u1ed9t s\u1ed1 m\u1eb9o \u0111\u1ec3 t\u00ednh to\u00e1n b\u1ed5 sung hi\u1ec7u qu\u1ea3 nh\u1ea5t<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>\u0110\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c t\u00ednh to\u00e1n s\u1ebd \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u trong L\u1edbp 2, c\u1ea7n ph\u1ea3i \u0111\u1ec1 c\u1eadp \u0111\u1ebfn to\u00e1n h\u1ecdc lo\u1ea1i 2 ph\u1ed5 bi\u1ebfn. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t h\u00e0nh l\u00fd v\u1eefng ch\u1eafc cho tr\u1ebb em, trong qu\u00e1 tr\u00ecnh h\u1ecdc to\u00e1n sau \u0111\u00f3.<\/p>\n<p>Ch\u00fang ta h\u00e3y xem kh\u1ec9 th\u00f4ng qua c\u00e1c h\u00ecnh th\u1ee9c c\u1ee7a l\u1edbp 2 v\u00e0 t\u00ednh to\u00e1n nhanh sau \u0111\u00e2y!<\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480.png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Khai_niem_ve_cac_so_co_ban_ngoai_ra\"><\/span>Kh\u00e1i ni\u1ec7m v\u1ec1 c\u00e1c s\u1ed1 c\u01a1 b\u1ea3n ngo\u00e0i ra<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Tr\u01b0\u1edbc khi xem x\u00e9t c\u00e1c t\u00ednh to\u00e1n c\u1ed9ng, ch\u00fang ta c\u1ea7n hi\u1ec3u c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n nh\u01b0 s\u1ed1 l\u01b0\u1ee3ng h\u00e0ng h\u00f3a v\u00e0 t\u1ed5ng s\u1ed1. V\u1eady thu\u1eadt ng\u1eef n\u00e0y l\u00e0 g\u00ec? V\u00e0 t\u1ed5ng c\u1ee7a t\u00ednh to\u00e1n l\u00e0 g\u00ec?<\/p>\n<p dir=\"ltr\">Theo \u0111\u1ecbnh ngh\u0129a chung trong to\u00e1n h\u1ecdc, thu\u1eadt ng\u1eef n\u00e0y l\u00e0 m\u1ed9t trong nh\u1eefng kh\u1ed1i l\u01b0\u1ee3ng t\u1ea1o th\u00e0nh m\u1ed9t t\u1ed5ng, m\u1ed9t ph\u1ea7n, m\u1ed9t kh\u1ed1i ho\u1eb7c t\u1ef7 l\u1ec7.<\/p>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi t\u1ed5ng, t\u1ed5ng ho\u1eb7c t\u1ed5ng s\u1ed1 l\u00e0 t\u00ednh to\u00e1n c\u1ee7a m\u1ed9t s\u1ed1 s\u1ed1. N\u1ebfu c\u00e1c s\u1ed1 c\u1ed9ng v\u1edbi tu\u1ea7n t\u1ef1 t\u1eeb tr\u00e1i sang ph\u1ea3i, k\u1ebft qu\u1ea3 trung gian c\u00f3 th\u1ec3 l\u00e0 t\u1ed5ng s\u1ed1, t\u1ed5ng t\u00edch l\u0169y ho\u1eb7c t\u1ed5ng s\u1ed1. V\u00e0 c\u00e1c s\u1ed1 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n \u0111\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thu\u1eadt ng\u1eef v\u00e0 ch\u00fang c\u00f3 th\u1ec3 l\u00e0 s\u1ed1 nguy\u00ean, s\u1ed1 h\u1ee3p l\u00fd, s\u1ed1 th\u1ef1c ho\u1eb7c s\u1ed1 ph\u1ee9c.<\/p>\n<p dir=\"ltr\">B\u1ea1n s\u1ebd d\u1ec5 d\u00e0ng hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1ecbnh ngh\u0129a n\u00e0y nhi\u1ec1u h\u01a1n khi b\u1ea1n nh\u00ecn v\u00e0o h\u00ecnh minh h\u1ecda d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/11-toan-lop-2-phep-cong.jpg\" alt=\"\" width=\"300\" height=\"97\"><\/p>\n<p dir=\"ltr\">Ho\u1eb7c trong m\u1ed9t b\u00e0i thuy\u1ebft tr\u00ecnh kh\u00e1c nh\u01b0 sau:<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/2-toan-lop-2-phep-cong.jpg\" alt=\"\" width=\"230\" height=\"171\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tinh_toan_chung_lop_2_chung\"><\/span>T\u00ednh to\u00e1n chung l\u1edbp 2 chung<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">M\u1ed9t s\u1ed1 h\u00ecnh th\u1ee9c t\u00ednh to\u00e1n c\u1ed9ng ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y v\u00e0 cho c\u00e1c b\u00e0i ki\u1ec3m tra l\u1edbp 2. B\u1edfi v\u00ec \u0111\u00e2y l\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 \u0111\u01a1n gi\u1ea3n v\u00e0 ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, v\u00ec v\u1eady cha m\u1eb9 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng h\u01b0\u1edbng d\u1eabn tr\u1ebb em \u1edf nh\u00e0.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Doc_viet_so_sanh_cac_so_trong_vong_100\"><\/span>M\u1eabu 1: \u0110\u1ecdc, vi\u1ebft, so s\u00e1nh c\u00e1c s\u1ed1 trong v\u00f2ng 100<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_1_Viet\"><\/span>B\u00e0i t\u1eadp 1: Vi\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">M\u1ed9t. C\u00e1ch \u0111\u1ecdc s\u1ed1 trong v\u00f2ng 100: <\/p>\n<p dir=\"ltr\">32: Ba m\u01b0\u01a1i hai<\/p>\n<p dir=\"ltr\">79: &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">90: &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">26: &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">55: &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">b. C\u00e1c s\u1ed1 ch\u1eef s\u1ed1 2, s\u1ed1 \u0111\u01a1n v\u1ecb \u0111\u01a1n v\u1ecb k\u00e9m h\u01a1n h\u00e0ng ch\u1ee5c s\u1ed1 3:<\/p>\n<p dir=\"ltr\">c. C\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, t\u1ed5ng 2 ch\u1eef s\u1ed1 l\u00e0 4:<\/p>\n<p dir=\"ltr\">d. S\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, k\u1ebft th\u00fac l\u00e0 5, l\u1edbn h\u01a1n 10 v\u00e0 d\u01b0\u1edbi 80:<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_2_Tim\"><\/span>B\u00e0i t\u1eadp 2: T\u00ecm<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 tr\u01b0\u1edbc l\u00e0 60:<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 ti\u1ebfp theo l\u00e0 60:<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00ecm t\u1ed5ng c\u1ee7a 2 s\u1ed1 b\u1ea1n v\u1eeba t\u00ecm th\u1ea5y:<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00ecm s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a 2 s\u1ed1 b\u1ea1n v\u1eeba t\u00ecm th\u1ea5y:<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ed5ng 59 v\u00e0 s\u1ed1 tr\u01b0\u1edbc \u0111\u00f3:<\/p>\n<\/li>\n<\/ul>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_3_Dien_vao_so_thich_hop_trong_trong\"><\/span>B\u00e0i t\u1eadp 3: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong tr\u1ed1ng<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">M\u1ed9t. 90, 91, 92, &#8230;&#8230;, &#8230;&#8230;.., &#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">b. 2, 4, 6, 8, &#8230;.., &#8230;&#8230;., &#8230;&#8230;., &#8230;&#8230;., &#8230;&#8230;., &#8230;&#8230;.<\/p>\n<p dir=\"ltr\">c. 30, 35, 40, &#8230;&#8230;.., &#8230;&#8230;.., &#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">d. 77, 66, 55, &#8230;&#8230;, &#8230;&#8230;.., &#8230;&#8230;.., &#8230;&#8230;.<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_4_Sap_xep_cac_so_sau_15_38_96_74_42_59\"><\/span>B\u00e0i t\u1eadp 4: S\u1eafp x\u1ebfp c\u00e1c s\u1ed1 sau: 15, 38, 96, 74, 42, 59<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li dir=\"ltr\">Theo th\u1ee9 t\u1ef1 t\u1eeb l\u1edbn \u0111\u1ebfn em b\u00e9:<\/li>\n<li dir=\"ltr\">\u0110\u1ec3 t\u1eeb tr\u1ebb \u0111\u1ebfn l\u1edbn:<\/li>\n<\/ul>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_5_Tim_x\"><\/span>B\u00e0i t\u1eadp 5: T\u00ecm x<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">M\u1ed9t. x &lt;15 &#8211; 6<\/p>\n<p dir=\"ltr\">b. 12 &#8211; 6<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Them_tru_va_nho_trong_vong_100\"><\/span>M\u1eabu 2: Th\u00eam, tr\u1eeb v\u00e0 nh\u1edb trong v\u00f2ng 100<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_1_Ket_noi_ket_qua_voi_tinh_toan\"><\/span>B\u00e0i t\u1eadp 1: K\u1ebft n\u1ed1i k\u1ebft qu\u1ea3 v\u1edbi t\u00ednh to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/3-toan-lop-2-phep-cong.png\" alt=\"\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_2_Ket_noi_2_Ket_qua_bang_nhau\"><\/span>B\u00e0i t\u1eadp 2: K\u1ebft n\u1ed1i 2 K\u1ebft qu\u1ea3 b\u1eb1ng nhau<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/4-toan-lop-2-phep-cong.png\" alt=\"\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_3_Dien_vao_so_thich_hop_trong_trong-2\"><\/span>B\u00e0i t\u1eadp 3: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong tr\u1ed1ng<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">Tr\u01b0\u1eddng h\u1ee3p 1:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/5-toan-lop-2-phep-cong.png\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Tr\u01b0\u1eddng h\u1ee3p 2:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/6-toan-lop-2-phep-cong.png\" alt=\"\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Tam_ly_tinh_toan_nhanh\"><\/span>M\u1eabu 3: T\u00e2m l\u00fd, t\u00ednh to\u00e1n nhanh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong c\u00e1c h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 2, \u0111\u00e2y l\u00e0 h\u00ecnh th\u1ee9c m\u00e0 b\u1ea1n ph\u1ea3i h\u01b0\u1edbng d\u1eabn con b\u1ea1n t\u00ednh to\u00e1n tinh th\u1ea7n theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 s\u1eb5n \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u01a1n gi\u1ea3n. Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd gi\u1edbi thi\u1ec7u c\u1ea9n th\u1eadn h\u01a1n trong ph\u1ea7n ti\u1ebfp theo v\u00e0 sau \u0111\u00e2y l\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_1_Vui_long_tinh_toan_cac_tinh_toan_sau\"><\/span>B\u00e0i t\u1eadp 1: Vui l\u00f2ng t\u00ednh to\u00e1n c\u00e1c t\u00ednh to\u00e1n sau<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li dir=\"ltr\">100 &#8211; 90 = &#8230;&#8230;&#8230;&#8230;..<\/li>\n<li dir=\"ltr\">100 &#8211; 20 = &#8230;&#8230;&#8230;&#8230;..<\/li>\n<li dir=\"ltr\">18 &#8211; 9 = &#8230;&#8230;&#8230;.<\/li>\n<li dir=\"ltr\">14 &#8211; 5 = &#8230;&#8230;&#8230;.<\/li>\n<li dir=\"ltr\">13 &#8211; 5 = &#8230;&#8230;&#8230;.<\/li>\n<\/ul>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_2_Tinh_toan_theo_bieu_mau\"><\/span>B\u00e0i t\u1eadp 2: T\u00ednh to\u00e1n (theo bi\u1ec3u m\u1eabu)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">V\u1eadt m\u1eabu:<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/40-toan-lop-2-phep-cong.png\" alt=\"\" width=\"200\" height=\"91\"><\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp:<\/p>\n<p dir=\"ltr\">M\u1ed9t. 56 + 29 <\/p>\n<p dir=\"ltr\">b. 39 + 45 <\/p>\n<p dir=\"ltr\">c. 66 + 17<\/p>\n<p dir=\"ltr\">d. 48 + 13 <\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_4_Tim_thanh_phan_tinh_toan_chua_biet\"><\/span>M\u1eabu 4: T\u00ecm th\u00e0nh ph\u1ea7n t\u00ednh to\u00e1n ch\u01b0a bi\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_1_Dien_vao_so_thich_hop_trong_hop\"><\/span>B\u00e0i t\u1eadp 1: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong h\u1ed9p<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/7-toan-lop-2-phep-cong.png\" alt=\"\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_2_Tim_x\"><\/span>B\u00e0i t\u1eadp 2: T\u00ecm x<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">45 + x = 56; x &#8211; 12 = 79; 76 &#8211; x = 29; x + 78 = 97<\/p>\n<p dir=\"ltr\">63 + 23 &#8211; x = 29; X &#8211; 12 + 45 = 59; 56 &#8211; 18 + x = 99; 49 + 26 + x = 84<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_3_Giai_quyet_cac_van_de_sau\"><\/span>B\u00e0i t\u1eadp 3: Gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 sau<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">M\u1ed9t. Bi\u1ebft s\u1ed1 l\u01b0\u1ee3ng l\u1edbn l\u00e0 76. S\u1ed1 th\u01b0\u01a1ng hi\u1ec7u 2 l\u00e0 23. T\u00ecm s\u1ed1 tr\u1ebb s\u01a1 sinh.<\/p>\n<p dir=\"ltr\">b. T\u1ed5ng c\u1ee7a 2 s\u1ed1 l\u00e0 87, s\u1ed1 \u0111\u1ea7u ti\u00ean l\u00e0 45. T\u00ecm s\u1ed1 th\u1ee9 hai.<\/p>\n<p dir=\"ltr\">c. Hai s\u1ed1 c\u00f3 t\u1ed5ng s\u1ed1 47. S\u1ed1 \u0111\u1ea7u ti\u00ean l\u00e0 2 s\u1ed1 ch\u1eef s\u1ed1 trong \u0111\u00f3 s\u1ed1 l\u01b0\u1ee3ng \u0111\u01a1n v\u1ecb th\u1ea5p h\u01a1n so v\u1edbi h\u00e0ng ch\u1ee5c 3. T\u00ecm 2 s\u1ed1.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Huong_dan_ve_cach_day_tre_em_nhanh_chong_tinh_toan\"><\/span>H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch d\u1ea1y tr\u1ebb em nhanh ch\u00f3ng t\u00ednh to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Nh\u01b0 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u1edf d\u1ea1ng to\u00e1n h\u1ecdc th\u1ee9 3 c\u1ed9ng v\u1edbi &#8220;tinh th\u1ea7n, nhanh&#8221;, \u0111\u00e2y l\u00e0 m\u1ed9t ph\u1ea7n m\u00e0 tr\u1ebb c\u1ea7n n\u1eafm b\u1eaft ngay khi ch\u00fang h\u1ecdc l\u1edbp 2. B\u00ean c\u1ea1nh \u0111\u00f3, c\u00e1c ph\u01b0\u01a1ng ph\u00e1p nhanh ch\u00f3ng n\u00e0y s\u1ebd h\u1ed7 tr\u1ee3 tr\u1ebb em ph\u00e1t tri\u1ec3n t\u01b0 duy logic v\u00e0 quan s\u00e1t c\u1ee7a ch\u00ednh ch\u00fang.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/8-toan-lop-2-phep-cong.jpg\" alt=\"Th\u1ef1c h\u00e0nh \u0111\u1ed9 s\u1eafc n\u00e9t trong suy ngh\u0129 c\u1ee7a tr\u1ebb em. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ap_dung_mot_tuyen_duong_5_de_day_tre_em_nhanh_chong\"><\/span>\u00c1p d\u1ee5ng m\u1ed9t tuy\u1ebfn \u0111\u01b0\u1eddng 5 \u0111\u1ec3 d\u1ea1y tr\u1ebb em nhanh ch\u00f3ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Buoc_1_Giup_tre_em_yeu_thich_va_hieu_them_ve_cac_con_so\"><\/span>B\u01b0\u1edbc 1: Gi\u00fap tr\u1ebb em y\u00eau th\u00edch v\u00e0 hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c con s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">\u1ede b\u01b0\u1edbc b\u1eaft \u0111\u1ea7u n\u00e0y, b\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng con b\u1ea1n hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 c\u00e1c con s\u1ed1 v\u00e0 th\u1ee9 t\u1ef1 c\u1ee7a ch\u00fang, trong ph\u1ea1m vi \u00edt nh\u1ea5t 100. N\u1ebfu kh\u00f4ng ch\u1eafc ch\u1eafn v\u1ec1 \u0111i\u1ec1u n\u00e0y, gi\u00fap tr\u1ebb ti\u1ebfp t\u1ee5c quen v\u1edbi c\u00e1c con s\u1ed1 theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0: h\u1ecdc c\u00e1ch \u0111\u1ebfm, d\u00e1n s\u1ed1 tr\u00ean t\u01b0\u1eddng, &#8230;<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Buoc_2_Day_tre_cach_dem_so\"><\/span>B\u01b0\u1edbc 2: D\u1ea1y tr\u1ebb c\u00e1ch \u0111\u1ebfm s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">Sau khi ch\u00fang t\u00f4i th\u1ef1c s\u1ef1 quen thu\u1ed9c v\u1edbi c\u00e1c con s\u1ed1, trong b\u01b0\u1edbc n\u00e0y, ch\u00fang t\u00f4i s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u1ec3 tr\u1ebb em quen v\u1edbi c\u00e1c con s\u1ed1, nh\u01b0ng \u1edf c\u1ea5p \u0111\u1ed9 cao h\u01a1n l\u00e0 \u0111\u1ebfm s\u1ed1 l\u1ea7n nh\u1ea3y. V\u00ed d\u1ee5: 2,4,5,6, .. ho\u1eb7c 1,5,10,15, &#8230;. <\/p>\n<p dir=\"ltr\">M\u1ee9c \u0111\u1ed9 c\u1ee7a s\u1ed1 l\u01b0\u1ee3ng s\u1ebd t\u0103ng d\u1ea7n theo kh\u1ea3 n\u0103ng c\u1ee7a tr\u1ebb. H\u00e3y \u0111\u1ec3 tr\u1ebb th\u1ef1c h\u00e0nh li\u00ean t\u1ee5c tr\u01b0\u1edbc khi \u0111i \u0111\u1ebfn b\u01b0\u1edbc ti\u1ebfp theo, cho \u0111\u1ebfn khi th\u00e0nh th\u1ea1o!<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/9-toan-lop-2-phep-cong.jpg\" alt=\"D\u1ea1y tr\u1ebb \u0111\u1ebfm s\u1ed1 c\u1ee7a ch\u00fang. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Buoc_3_Su_dung_cac_mat_hang_ho_tro_cho_tre_em\"><\/span>B\u01b0\u1edbc 3: S\u1eed d\u1ee5ng c\u00e1c m\u1eb7t h\u00e0ng h\u1ed7 tr\u1ee3 cho tr\u1ebb em<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">\u1ede \u0111\u00e2y ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c v\u1eadt ph\u1ea9m quen thu\u1ed9c v\u00e0 tr\u00f9ng v\u1edbi s\u1edf th\u00edch c\u1ee7a tr\u1ebb c\u00e0ng t\u1ed1t. \u0110\u01a1n gi\u1ea3n nh\u1ea5t l\u00e0 \u0111\u1ed3 ch\u01a1i ng\u00f3n tay ho\u1eb7c \u0111\u1ed3 ch\u01a1i c\u1ee7a tr\u1ebb em. <\/p>\n<p dir=\"ltr\">V\u1edbi c\u00e1c t\u00ednh to\u00e1n l\u1edbn h\u01a1n, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c g\u1eady trong c\u00e1c b\u1ed9 to\u00e1n h\u1ecdc l\u1edbp 2. V\u00e0 b\u1eb1ng c\u00e1ch th\u00eam ho\u1eb7c tr\u1eeb c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng xung quanh tr\u1ebb, n\u00f3 s\u1ebd gi\u00fap con b\u1ea1n h\u00ecnh dung c\u00e1c t\u00ednh to\u00e1n trong \u0111\u1ea7u theo c\u00e1ch r\u00f5 r\u00e0ng nh\u1ea5t.<\/p>\n<p dir=\"ltr\">Xem th\u00eam: M\u1ea5t to\u00e1n l\u1edbp 2 Miss: Kh\u00e1i ni\u1ec7m, H\u01b0\u1edbng d\u1eabn gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp li\u00ean quan<\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Buoc_4_Tim_hieu_%E2%80%93_Choi\"><\/span>B\u01b0\u1edbc 4: T\u00ecm hi\u1ec3u &#8211; Ch\u01a1i<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi to\u00e1n h\u1ecdc n\u00f3i chung v\u00e0 to\u00e1n h\u1ecdc l\u1edbp 2 n\u00f3i ri\u00eang, \u0111\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c nh\u00e0m ch\u00e1n nh\u1ea5t cho tr\u1ebb em. Do \u0111\u00f3, b\u1ea1n c\u1ea7n li\u00ean t\u1ee5c thay \u0111\u1ed5i ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y \u0111\u1ec3 kh\u00f4ng g\u00e2y ra s\u1ef1 nh\u00e0m ch\u00e1n cho tr\u1ebb em. <\/p>\n<p dir=\"ltr\">\u0110\u1ed3ng th\u1eddi, \u00e1p d\u1ee5ng c\u00e1c tr\u00f2 ch\u01a1i to\u00e1n h\u1ecdc v\u00e0o ph\u01b0\u01a1ng ph\u00e1p gi\u00e1o d\u1ee5c t\u1ea1i nh\u00e0 c\u1ee7a b\u1ea1n. Vi\u1ec7c h\u1ecdc c\u1ee7a tr\u1ebb \u0111\u00fang trong khi ch\u01a1i, s\u1ebd gi\u00fap t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng ti\u1ebfp thu ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 tr\u1ebb em. T\u1eeb \u0111\u00f3, c\u1ee7ng c\u1ed1 b\u1ed9 n\u00e3o c\u1ee7a tr\u1ebb \u0111\u1ec3 nh\u1eadn v\u00e0 ghi nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c r\u00f5 r\u00e0ng h\u01a1n.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/10-toan-lop-2-phep-cong.jpg\" alt=\"Ph\u01b0\u01a1ng ph\u00e1p t\u00edch h\u1ee3p ki\u1ebfn \u200b\u200bth\u1ee9c v\u00e0o tr\u00f2 ch\u01a1i. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Buoc_5_Thay_doi_hinh_thuc_hoc_tap\"><\/span>B\u01b0\u1edbc 5: Thay \u0111\u1ed5i h\u00ecnh th\u1ee9c h\u1ecdc t\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">Thay v\u00ec \u0111\u1ec3 tr\u1ebb h\u1ecdc c\u00e1ch t\u00ednh to\u00e1n th\u1ee7 c\u00f4ng, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p cho tr\u1ebb em s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m t\u00ednh to\u00e1n song song. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap h\u00ecnh th\u00e0nh c\u00e1c li\u00ean k\u1ebft trong n\u00e3o c\u1ee7a tr\u1ebb, t\u1eeb \u0111\u00f3 \u0111\u01b0a ra c\u00e2u tr\u1ea3 l\u1eddi cho c\u00e1c t\u00ednh to\u00e1n c\u0169ng nhanh h\u01a1n.<\/p>\n<p dir=\"ltr\">Ngo\u00e0i ra, vi\u1ec7c \u00e1p d\u1ee5ng ph\u1ea7n m\u1ec1m c\u00f3 uy t\u00edn trong qu\u00e1 tr\u00ecnh gi\u00e1o d\u1ee5c tr\u1ebb em, s\u1ebd gi\u00fap con b\u1ea1n \u0111\u01b0\u1ee3c ti\u1ebfp x\u00fac v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y hi\u1ec7n \u0111\u1ea1i nh\u1ea5t. \u0110\u1eb7c bi\u1ec7t l\u00e0 h\u00ecnh \u1ea3nh v\u00e0 \u00e2m thanh lu\u00f4n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u1ea3m x\u00fac v\u00e0 t\u1ea1o ra s\u1ef1 ph\u1ea5n kh\u00edch cho tr\u1ebb em. <\/p>\n<p dir=\"ltr\">H\u01a1n n\u1eefa, ki\u1ebfn \u200b\u200bth\u1ee9c kh\u00f4 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o tr\u00f2 ch\u01a1i t\u01b0\u01a1ng t\u00e1c b\u00ean trong \u1ee9ng d\u1ee5ng. S\u1ebd gi\u00fap tr\u1ebb hi\u1ec3u v\u00e0 tr\u00e1nh nh\u00e0m ch\u00e1n trong khi \u0111i h\u1ecdc.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/11-toan-lop-2-phep-cong.png\" alt=\"Ph\u1ea7n m\u1ec1m to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh cho tr\u1ebb em. (\u1ea2nh: Kh\u1ec9)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Hi\u1ec7n t\u1ea1i c\u00f3 nhi\u1ec1u ph\u1ea7n m\u1ec1m \u0111\u1ec3 d\u1ea1y to\u00e1n tr\u00ean th\u1ecb tr\u01b0\u1eddng. Tuy nhi\u00ean, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math v\u1eabn l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ee9a tr\u1ebb d\u1ea1y ti\u1ebfng Anh hi\u1ec7u qu\u1ea3 nh\u1ea5t \u0111\u1ec3 h\u1ecdc tr\u1ebb em. \u0110\u00e2y l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c nhi\u1ec1u ph\u1ee5 huynh tin t\u01b0\u1edfng, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea3i xu\u1ed1ng v\u00e0 cho con b\u1ea1n d\u00f9ng th\u1eed mi\u1ec5n ph\u00ed t\u1ea1i \u0111\u00e2y:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch Play App Store (cho thi\u1ebft b\u1ecb Android)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">App Store Store (d\u00e0nh cho thi\u1ebft b\u1ecb iOS)<\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_meo_de_tinh_toan_bo_sung_hieu_qua_nhat\"><\/span>M\u1ed9t s\u1ed1 m\u1eb9o \u0111\u1ec3 t\u00ednh to\u00e1n b\u1ed5 sung hi\u1ec7u qu\u1ea3 nh\u1ea5t<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Sau khi \u00e1p d\u1ee5ng tuy\u1ebfn \u0111\u01b0\u1eddng 5 nh\u01b0 tr\u00ean, cha m\u1eb9 n\u00ean th\u1eed c\u00e1c m\u1eb9o sau \u0111\u1ec3 t\u00ednh to\u00e1n c\u00e1c m\u1eb9o sau, \u0111\u1ec3 t\u0103ng hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ph\u00e1p n\u00e0y. <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Khi th\u00eam hai ch\u1eef s\u1ed1 l\u1ea1i v\u1edbi nhau, \u0111\u1eb7t m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn ph\u00eda tr\u01b0\u1edbc v\u00e0 s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf ph\u00eda sau, sau \u0111\u00f3 b\u1eaft \u0111\u1ea7u \u0111\u1ebfm. V\u00ed d\u1ee5: 3 + 45, tinh th\u1ea7n 45 + 3. \u0110i\u1ec1u \u0111\u00f3 d\u1ec5 d\u00e0ng h\u01a1n nhi\u1ec1u khi tr\u1ebb t\u00ednh t\u00ednh to\u00e1n c\u1ed9ng c\u1ee7a hai ho\u1eb7c nhi\u1ec1u thu\u1eadt ng\u1eef.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u00e1ch s\u1ed1 th\u00e0nh h\u00e0ng t\u00e1 v\u00e0 sau \u0111\u00f3 th\u00eam. V\u00ed d\u1ee5: 28 + 7 = 28 + 2 + 5 = 30 + 5 = 35. C\u1ed9ng v\u1edbi c\u00e1c s\u1ed1 v\u00f2ng ho\u1eb7c cu\u1ed1i c\u1ee7a cu\u1ed1i 5 s\u1ebd d\u1ec5 d\u00e0ng h\u01a1n so v\u1edbi ph\u1ea7n c\u00f2n l\u1ea1i.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1eed d\u1ee5ng v\u00f2ng m\u1edbi nh\u1ea5t v\u00e0 sau \u0111\u00f3 ngo\u1ea1i tr\u1eeb s\u1ed1 d\u01b0. V\u00ed d\u1ee5: 24 + 29 = 30 + 30 &#8211; 6 &#8211; 1 = 53. \u0110\u00e2y l\u00e0 m\u1ed9t t\u00ednh to\u00e1n ng\u01b0\u1ee3c l\u1ea1i so v\u1edbi t\u00ednh to\u00e1n tr\u00ean.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Chia s\u1ed1 th\u00e0nh h\u00e0ng t\u00e1 v\u00e0 sau \u0111\u00f3 c\u1ed9ng v\u1edbi s\u1ed1 l\u1ebb. V\u00ed d\u1ee5: 46 + 23 = 40 + 20 + 6 + 3 = 60 + 9 = 69.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/12-toan-lop-2-phep-cong.jpg\" alt=\"D\u1ea1y tr\u1ebb t\u00ednh to\u00e1n c\u00e1c m\u1eb9o m\u1ed9t c\u00e1ch nhanh ch\u00f3ng. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc l\u1edbp 2 v\u00e0 c\u00e1ch d\u1ea1y tr\u1ebb v\u1ec1 tinh th\u1ea7n. Hy v\u1ecdng r\u1eb1ng, v\u1edbi nh\u1eefng chia s\u1ebb n\u00e0y t\u1eeb Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef, n\u00f3 s\u1ebd gi\u00fap b\u1ea1n nu\u00f4i con d\u1ec5 d\u00e0ng h\u01a1n. <\/p>\n<p>Vui l\u00f2ng ti\u1ebfp t\u1ee5c theo d\u00f5i kh\u1ec9 \u0111\u1ec3 xem c\u00e1c b\u00e0i vi\u1ebft h\u1eefu \u00edch kh\u00e1c. Xin vui l\u00f2ng \u0111i c\u00f9ng b\u1ea1n!<\/p>\n<p>Ngu\u1ed3n: <a href=\"http:\/\/www.ckconitsha.com\/vn\/\">http:\/\/www.ckconitsha.com\/vn\/<\/a> T\u00e1c gi\u1ea3: <a href=\"https:\/\/www.ckconitsha.com\/vn\/author\/nguyenlandung\">Nguy\u1ec5n L\u00e2n d\u0169ng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c t\u00ednh to\u00e1n s\u1ebd \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u trong L\u1edbp 2, c\u1ea7n ph\u1ea3i \u0111\u1ec1 c\u1eadp \u0111\u1ebfn to\u00e1n h\u1ecdc lo\u1ea1i 2 ph\u1ed5 bi\u1ebfn. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t h\u00e0nh l\u00fd v\u1eefng ch\u1eafc cho tr\u1ebb em, trong qu\u00e1 tr\u00ecnh h\u1ecdc to\u00e1n sau \u0111\u00f3. Ch\u00fang ta h\u00e3y xem&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-21783","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=21783"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21783\/revisions"}],"predecessor-version":[{"id":26048,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/21783\/revisions\/26048"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=21783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=21783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=21783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}