{"id":15022,"date":"2025-06-11T14:10:43","date_gmt":"2025-06-11T07:10:43","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=15022"},"modified":"2025-07-06T00:30:05","modified_gmt":"2025-07-05T17:30:05","slug":"huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn h\u1ecdc to\u00e1n l\u1edbp 4 gi\u00e2y th\u1ebf k\u1ec9 \u0111\u01a1n gi\u1ea3n, d\u1ec5 hi\u1ec3u nh\u1ea5t"},"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\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Toan_hoc_lop_4_giay_la_gi\" >To\u00e1n h\u1ecdc l\u1edbp 4 gi\u00e2y l\u00e0 g\u00ec?<\/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\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Cac_cach_de_thay_doi_cac_don_vi_cua_the_ky_trong_toan_hoc_lop_4\" >C\u00e1c c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb c\u1ee7a th\u1ebf k\u1ef7 trong to\u00e1n h\u1ecdc l\u1edbp 4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Tom_tat_cac_bai_tap_toan_4_giay_voi_cac_giai_phap_chi_tiet\" >T\u00f3m t\u1eaft c\u00e1c b\u00e0i t\u1eadp to\u00e1n 4 gi\u00e2y v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p chi ti\u1ebft<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Giai_tap_cac_bai_tap_trong_the_ky_toan_lop_4_trang_25_sach_giao_khoa\" >Gi\u1ea3i t\u1eadp c\u00e1c b\u00e0i t\u1eadp trong th\u1ebf k\u1ef7 to\u00e1n l\u1edbp 4, trang 25 s\u00e1ch gi\u00e1o khoa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Giai_tap_cac_bai_tap_trong_the_ky_toan_lop_4_trang_26_SGK\" >Gi\u1ea3i t\u1eadp c\u00e1c b\u00e0i t\u1eadp trong th\u1ebf k\u1ef7 to\u00e1n l\u1edbp 4, trang 26 SGK<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Mot_so_bai_tap_toan_trong_the_ky_thu_hai_da_mo_rong_toan_hoc_lop_4_de_ho_thuc_hanh_ban_than\" >M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n trong th\u1ebf k\u1ef7 th\u1ee9 hai \u0111\u00e3 m\u1edf r\u1ed9ng to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 h\u1ecd th\u1ef1c h\u00e0nh b\u1ea3n th\u00e2n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Bi_quyet_de_giup_tre_hoc_toan_4_giay_trong_the_ky_mot_cach_hieu_qua\" >B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc to\u00e1n 4 gi\u00e2y trong th\u1ebf k\u1ef7 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/huong-dan-hoc-toan-lop-4-giay-the-ki-don-gian-de-hieu-nhat\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>Nghi\u00ean c\u1ee9u to\u00e1n h\u1ecdc 4 gi\u00e2y trong th\u1ebf k\u1ef7 l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n, kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong to\u00e1n h\u1ecdc m\u00e0 c\u00f2n li\u00ean quan \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 th\u1eddi gian th\u1ef1c t\u1ebf. V\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc t\u1ed1t v\u1ec1 ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y, Kh\u1ec9 s\u1ebd t\u00f3m t\u1eaft c\u00e1c m\u1eb9o v\u00e0 b\u00e0i t\u1eadp gi\u1ea3ng d\u1ea1y t\u1ed1t \u0111\u1ec3 ch\u00fang th\u1ef1c h\u00e0nh hi\u1ec7u qu\u1ea3.<\/p>\n<p>                                                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img_default\/monkey3.png\" alt=\"\"><\/p>\n<p class=\"title\">H\u00e0ng tri\u1ec7u tr\u1ebb em \u0111\u00e3 ph\u00e1t tri\u1ec3n c\u00e1c k\u1ef9 n\u0103ng ng\u00f4n ng\u1eef c\u1ee7a ch\u00fang th\u00f4ng qua c\u00e1c \u1ee9ng d\u1ee5ng h\u1ecdc t\u1eadp c\u1ee7a kh\u1ec9<\/p>\n<p class=\"description\">\u0110\u0103ng k\u00fd ngay \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u1ec1 c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 tuy\u1ebfn h\u1ecdc h\u1ecdc cho tr\u1ebb em.<\/p>\n<p>                                                                            *Vui l\u00f2ng ki\u1ec3m tra t\u00ean \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a b\u1ea1n *Vui l\u00f2ng ki\u1ec3m tra s\u1ed1 \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Toan_hoc_lop_4_giay_la_gi\"><\/span>To\u00e1n h\u1ecdc l\u1edbp 4 gi\u00e2y l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Gi\u00e2y c\u1ee7a th\u1ebf k\u1ef7 v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 th\u1eddi gian \u0111o th\u1eddi gian. Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">Gi\u00e2y: Th\u1eddi gian \u0111o \u0111\u01a1n v\u1ecb nh\u1ecf, t\u1ee9c l\u00e0 1 ph\u1ea7n 60 s\u1ebd l\u00e0 1 ph\u00fat.<\/li>\n<li dir=\"ltr\">Th\u1ebf k\u1ef7: Th\u1eddi gian \u0111o \u0111\u01a1n v\u1ecb l\u00e0 l\u1edbn, l\u00ean \u0111\u1ebfn h\u00e0ng tr\u0103m n\u0103m. L\u1edbn h\u01a1n nhi\u1ec1u l\u1ea7n so v\u1edbi \u0111\u01a1n v\u1ecb th\u1ee9 hai.<\/li>\n<\/ul>\n<p dir=\"ltr\">V\u00ed d\u1ee5:<\/p>\n<p dir=\"ltr\"><em>60 gi\u00e2y = 1 ph\u00fat<\/em><\/p>\n<p dir=\"ltr\"><em>1 th\u1ebf k\u1ef7 = 100 n\u0103m<\/em><\/p>\n<p dir=\"ltr\"><em>5 th\u1ebf k\u1ef7 = 500 n\u0103m<\/em><\/p>\n<p dir=\"ltr\"><em>100 n\u0103m = 1 th\u1ebf k\u1ef7<\/em><\/p>\n<p dir=\"ltr\"><em>9 th\u1ebf k\u1ef7 = 900 n\u0103m<\/em><\/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\/toan-lop-4-giay-the-ki-1.jpg\" alt=\"Gi\u00e2y, nhi\u1ec1u th\u1ebf k\u1ef7 th\u1ef1c s\u1ef1 l\u00e0 \u0111\u01a1n v\u1ecb th\u1eddi gian. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_cach_de_thay_doi_cac_don_vi_cua_the_ky_trong_toan_hoc_lop_4\"><\/span>C\u00e1c c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb c\u1ee7a th\u1ebf k\u1ef7 trong to\u00e1n h\u1ecdc l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">V\u1ec1 b\u1ea3n ch\u1ea5t, vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb c\u1ee7a th\u1ebf k\u1ef7 c\u0169ng kh\u00e1 \u0111\u01a1n gi\u1ea3n. C\u1ee5 th\u1ec3:<\/p>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #FBEEB8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">1 gi\u1edd = 60 ph\u00fat v\u00e0 1 ph\u00fat = 60 gi\u00e2y<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">1 th\u1ebf k\u1ef7 = 100 n\u0103m<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1eeb n\u0103m 1 \u0111\u1ebfn 100 l\u00e0 th\u1ebf k\u1ef7 th\u1ee9 nh\u1ea5t (th\u1ebf k\u1ef7 th\u1ee9 nh\u1ea5t)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1eeb 101 \u0111\u1ebfn 200 l\u00e0 th\u1ebf k\u1ef7 th\u1ee9 hai (th\u1ebf k\u1ef7 th\u1ee9 hai)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u2026.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1eeb 2001 \u0111\u1ebfn 2100 l\u00e0 th\u1ebf k\u1ef7 hai m\u01b0\u01a1i (th\u1ebf k\u1ef7 21)<\/p>\n<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/table>\n<p dir=\"ltr\">* L\u01b0u \u00fd: Th\u1ebf k\u1ef7 th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng ch\u1eef s\u1ed1 La M\u00e3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tom_tat_cac_bai_tap_toan_4_giay_voi_cac_giai_phap_chi_tiet\"><\/span>T\u00f3m t\u1eaft c\u00e1c b\u00e0i t\u1eadp to\u00e1n 4 gi\u00e2y v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p chi ti\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap h\u1ecd d\u1ec5 d\u00e0ng chinh ph\u1ee5c to\u00e1n h\u1ecdc n\u00e0y, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n h\u1ecdc trong to\u00e1n h\u1ecdc l\u1edbp 4 v\u1edbi c\u00e1c h\u01b0\u1edbng d\u1eabn chi ti\u1ebft:<\/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\/toan-lop-4-giay-the-ki-2.jpg\" alt=\"C\u00f3 nhi\u1ec1u b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn gi\u00e2y v\u00e0 th\u1ebf k\u1ef7 v\u1ec1 to\u00e1n h\u1ecdc v\u00e0 th\u1ef1c h\u00e0nh. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_tap_cac_bai_tap_trong_the_ky_toan_lop_4_trang_25_sach_giao_khoa\"><\/span>Gi\u1ea3i t\u1eadp c\u00e1c b\u00e0i t\u1eadp trong th\u1ebf k\u1ef7 to\u00e1n l\u1edbp 4, trang 25 s\u00e1ch gi\u00e1o khoa<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i ph\u00e1p: Tr\u1ebb em \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc \u0111\u1ec3 thay \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb v\u00e0 c\u00e1c th\u1ebf k\u1ef7 tr\u00ean \u0111\u1ec3 gi\u1ea3i quy\u1ebft b\u00e0i t\u1eadp.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 Trang 25 B\u00e0i 1:<\/p>\n<p dir=\"ltr\">Vi\u1ebft s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a) 1 ph\u00fat = &#8230; gi\u00e2y <\/p>\n<p dir=\"ltr\">60 gi\u00e2y = &#8230; ph\u00fat<\/p>\n<p dir=\"ltr\">2 ph\u00fat = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">7 ph\u00fat = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">1\/3 ph\u00fat = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">1 ph\u00fat 8 gi\u00e2y = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">b) 1 th\u1ebf k\u1ef7 = &#8230; n\u0103m<\/p>\n<p dir=\"ltr\">100 n\u0103m = &#8230;.. th\u1ebf k\u1ef7<\/p>\n<p dir=\"ltr\">5 th\u1ebf k\u1ef7 = &#8230; n\u0103m<\/p>\n<p dir=\"ltr\">9 th\u1ebf k\u1ef7 = &#8230;. n\u0103m<\/p>\n<p dir=\"ltr\">1\/2 th\u1ebf k\u1ef7 = &#8230; n\u0103m<\/p>\n<p dir=\"ltr\">1\/5 th\u1ebf k\u1ef7 = &#8230;. n\u0103m<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">a) 1 ph\u00fat = 60 gi\u00e2y<\/p>\n<p dir=\"ltr\">60 gi\u00e2y = 1 ph\u00fat<\/p>\n<p dir=\"ltr\">2 ph\u00fat = 120 gi\u00e2y<\/p>\n<p dir=\"ltr\">7 ph\u00fat = 420 gi\u00e2y<\/p>\n<p dir=\"ltr\">1\/3 ph\u00fat = 20 gi\u00e2y <\/p>\n<p dir=\"ltr\">1 ph\u00fat 8 gi\u00e2y = 68 gi\u00e2y<\/p>\n<p dir=\"ltr\">b) 1 th\u1ebf k\u1ef7 = 100 n\u0103m<\/p>\n<p dir=\"ltr\">100 n\u0103m = 1 th\u1ebf k\u1ef7<\/p>\n<p dir=\"ltr\">5 th\u1ebf k\u1ef7 = 500 n\u0103m<\/p>\n<p dir=\"ltr\">9 th\u1ebf k\u1ef7 = 900 n\u0103m<\/p>\n<p dir=\"ltr\">1\/2 th\u1ebf k\u1ef7 = 50 n\u0103m<\/p>\n<p dir=\"ltr\">1\/5 th\u1ebf k\u1ef7 = 20 n\u0103m<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 25 B\u00e0i 2:<\/p>\n<p dir=\"ltr\">A) Ch\u00fa Ho \u0111\u01b0\u1ee3c sinh ra v\u00e0o n\u0103m 1890. Ch\u00fa Ho \u0111\u01b0\u1ee3c sinh ra th\u1ebf k\u1ef7 n\u00e0o trong th\u1ebf k\u1ef7?<\/p>\n<p dir=\"ltr\">Ch\u00fa Ho \u0111\u00e3 \u0111i t\u00ecm c\u00e1ch c\u1ee9u \u0111\u1ea5t n\u01b0\u1edbc v\u00e0o n\u0103m 1911. N\u0103m \u0111\u00f3 l\u00e0 th\u1ebf k\u1ef7 n\u00e0o?<\/p>\n<p dir=\"ltr\">b) Cu\u1ed9c c\u00e1ch m\u1ea1ng th\u00e1ng 8 n\u0103m 1945 th\u1ebf k\u1ef7 n\u00e0o n\u0103m n\u00e0o?<\/p>\n<p dir=\"ltr\">c) B\u00e0 Trieu d\u1eabn \u0111\u1ea7u cu\u1ed9c n\u1ed5i d\u1eady ch\u1ed1ng l\u1ea1i qu\u00e2n \u0111\u1ed9i Dong NGO v\u00e0o n\u0103m 248. Th\u1ebf k\u1ef7 \u0111\u00f3 l\u00e0 th\u1ebf k\u1ef7 n\u00e0o?<\/p>\n<p dir=\"ltr\">&#8230;&#8230;&#8230;&#8230;&#8230;<\/p>\n<p dir=\"ltr\">&#8211; T\u1eeb n\u0103m 1901 \u0111\u1ebfn 2000 l\u00e0 th\u1ebf k\u1ef7 th\u1ee9 hai m\u01b0\u01a1i (th\u1ebf k\u1ef7 XX).<\/p>\n<p dir=\"ltr\">&#8211; T\u1eeb n\u0103m 2001 \u0111\u1ebfn 2100 l\u00e0 th\u1ebf k\u1ef7 hai m\u01b0\u01a1i (th\u1ebf k\u1ef7 21).<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">A) Ch\u00fa Ho sinh n\u0103m 1890. Ch\u00fa Ho \u0111\u01b0\u1ee3c sinh ra v\u00e0o th\u1ebf k\u1ef7 XIX (th\u1ebf k\u1ef7 XIX)<\/p>\n<p dir=\"ltr\">Ch\u00fa Ho \u0111\u00e3 \u0111i t\u00ecm c\u00e1ch c\u1ee9u \u0111\u1ea5t n\u01b0\u1edbc v\u00e0o n\u0103m 1911. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7 XX (th\u1ebf k\u1ef7 XX)<\/p>\n<p dir=\"ltr\">b) Cu\u1ed9c c\u00e1ch m\u1ea1ng th\u00e1ng 8 \u0111\u00e3 th\u00e0nh c\u00f4ng v\u00e0o n\u0103m 1945. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7 XX (th\u1ebf k\u1ef7 XX).<\/p>\n<p dir=\"ltr\">c) B\u00e0 Trieu l\u00e3nh \u0111\u1ea1o cu\u1ed9c n\u1ed5i d\u1eady ch\u1ed1ng l\u1ea1i qu\u00e2n \u0111\u1ed9i Dong NGO n\u0103m 248. N\u0103m \u0111\u00f3 v\u00e0o th\u1ebf k\u1ef7 th\u1ee9 ba (th\u1ebf k\u1ef7 III)<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 25 B\u00e0i 3:<\/p>\n<p dir=\"ltr\">a) ly Thai \u0111\u1ec3 chuy\u1ec3n th\u1ee7 \u0111\u00f4 \u0111\u1ebfn Long Long v\u00e0o n\u0103m 1010. th\u1ebf k\u1ef7 n\u00e0o trong n\u0103m \u0111\u00f3? N\u00f3 l\u00e0 bao nhi\u00eau n\u0103m?<\/p>\n<p dir=\"ltr\">B) Ng\u1ef1c QUYEN \u0111\u00e3 \u0111\u00e1nh b\u1ea1i qu\u00e2n \u0111\u1ed9i Nam Han tr\u00ean s\u00f4ng Bach Dang v\u00e0o n\u0103m 938. Th\u1ebf k\u1ef7 n\u00e0o trong n\u0103m \u0111\u00f3? N\u00f3 l\u00e0 bao nhi\u00eau n\u0103m?<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">a) ly Thai \u0111\u1ec3 chuy\u1ec3n th\u1ee7 \u0111\u00f4 \u0111\u1ebfn Thang Long v\u00e0o n\u0103m 1010. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7 11.<\/p>\n<p dir=\"ltr\">Cho \u0111\u1ebfn nay (2021) l\u00e0 s\u1ed1 n\u0103m:<\/p>\n<p dir=\"ltr\">2021 &#8211; 1010 = 1011 (n\u0103m)<\/p>\n<p dir=\"ltr\">B) Ng\u1ef1c QUYEN \u0111\u00e3 \u0111\u00e1nh b\u1ea1i qu\u00e2n \u0111\u1ed9i Nam Han tr\u00ean s\u00f4ng Bach Dang n\u0103m 938. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7 th\u1ee9 10.<\/p>\n<p dir=\"ltr\">Cho \u0111\u1ebfn nay (2021) l\u00e0 s\u1ed1 n\u0103m:<\/p>\n<p dir=\"ltr\">2021 &#8211; 938 = 1083 (n\u0103m).<\/p>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #FBEEB8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<p style=\"text-align: center\">X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho tr\u1ebb em t\u1eeb khi c\u00f2n nh\u1ecf v\u1edbi \u0111a ph\u01b0\u01a1ng ti\u1ec7n, c\u1ef1c k\u1ef3 r\u1ebb c\u00f3 gi\u00e1 d\u01b0\u1edbi 2k\/ng\u00e0y v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9.<\/p>\n<p style=\"text-align: center\">\n<p><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/timhieungay.png\" alt=\"\" width=\"200\" height=\"41\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_tap_cac_bai_tap_trong_the_ky_toan_lop_4_trang_26_SGK\"><\/span>Gi\u1ea3i t\u1eadp c\u00e1c b\u00e0i t\u1eadp trong th\u1ebf k\u1ef7 to\u00e1n l\u1edbp 4, trang 26 SGK<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd c\u1ea7n xem x\u00e9t ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 c\u00e1c \u0111\u01a1n v\u1ecb \u0111o th\u1eddi gian nh\u01b0 ng\u00e0y, th\u00e1ng, n\u0103m, gi\u1edd, ph\u00fat v\u00e0 gi\u00e2y \u0111\u1ec3 gi\u1ea3i t\u1eadp ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 26 B\u00e0i 1:<\/p>\n<p dir=\"ltr\">a) K\u1ec3 t\u00ean c\u00e1c th\u00e1ng: 30 ng\u00e0y; 31 ng\u00e0y; 28 (ho\u1eb7c 29) ng\u00e0y.<\/p>\n<p dir=\"ltr\">b) ch\u1ec9 ra: n\u0103m b\u01b0\u1edbc nh\u1ea3y l\u00e0 n\u0103m m\u00e0 th\u00e1ng hai c\u00f3 29 ng\u00e0y<\/p>\n<p dir=\"ltr\">Trong nh\u1eefng n\u0103m b\u01b0\u1edbc nh\u1ea3y, th\u00e1ng hai ch\u1ec9 l\u00e0 28 ng\u00e0y.<\/p>\n<p dir=\"ltr\">C\u00e2u h\u1ecfi: Bao nhi\u00eau ng\u00e0y? C\u00f3 bao nhi\u00eau ng\u00e0y m\u00e0 kh\u00f4ng c\u00f3 b\u01b0\u1edbc nh\u1ea3y v\u1ecdt?<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">a) C\u00e1c th\u00e1ng 30 ng\u00e0y l\u00e0: Th\u00e1ng T\u01b0; Th\u00e1ng s\u00e1u; Th\u00e1ng 9; Th\u00e1ng m\u01b0\u1eddi m\u1ed9t.<\/p>\n<p dir=\"ltr\">C\u00e1c th\u00e1ng 31 ng\u00e0y l\u00e0: th\u00e1ng m\u1ed9t; B\u01b0\u1edbc \u0111\u1ec1u; C\u00f3 th\u1ec3; Th\u00e1ng b\u1ea3y; Th\u00e1ng t\u00e1m; Th\u00e1ng 10; Th\u00e1ng 12.<\/p>\n<p dir=\"ltr\">Th\u00e1ng c\u00f3 28 (ho\u1eb7c 29) ng\u00e0y l\u00e0 th\u00e1ng hai.<\/p>\n<p dir=\"ltr\">b) N\u0103m b\u01b0\u1edbc nh\u1ea3y c\u00f3 266 ng\u00e0y. N\u0103m kh\u00f4ng c\u00f3 365 ng\u00e0y.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 26 B\u00e0i 2:<\/p>\n<p dir=\"ltr\">3 ng\u00e0y = &#8230; th\u1eddi gian<\/p>\n<p dir=\"ltr\">4 gi\u1edd = &#8230;. ph\u00fat<\/p>\n<p dir=\"ltr\">8 ph\u00fat = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">1\/3 ng\u00e0y = &#8230; th\u1eddi gian<\/p>\n<p dir=\"ltr\">1\/4 th\u1eddi gian = &#8230;. th\u1eddi gian<\/p>\n<p dir=\"ltr\">1\/2 ph\u00fat = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">3 gi\u1edd 10 ph\u00fat = &#8230; gi\u1edd<\/p>\n<p dir=\"ltr\">2 ph\u00fat 5 gi\u00e2y = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">4 ph\u00fat 20 gi\u00e2y = &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">3 ng\u00e0y = 72 gi\u1edd<\/p>\n<p dir=\"ltr\">4 gi\u1edd = 240 ph\u00fat<\/p>\n<p dir=\"ltr\">8 ph\u00fat = 480 gi\u00e2y <\/p>\n<p dir=\"ltr\">1\/3 ng\u00e0y = 8 gi\u00e2y <\/p>\n<p dir=\"ltr\">1\/4 gi\u1edd = 6 gi\u1edd<\/p>\n<p dir=\"ltr\">1\/2 ph\u00fat = 30 gi\u00e2y<\/p>\n<p dir=\"ltr\">3 gi\u1edd 10 ph\u00fat = 190 gi\u1edd<\/p>\n<p dir=\"ltr\">2 ph\u00fat 5 gi\u00e2y = 125 gi\u00e2y<\/p>\n<p dir=\"ltr\">4 ph\u00fat 20 gi\u00e2y = 260 gi\u00e2y<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 26 B\u00e0i 3:<\/p>\n<p dir=\"ltr\">A) Qu\u00e1n Trung Dai \u0111\u00e3 ph\u00e1 v\u1ee1 Qu\u00e2n \u0111\u1ed9i Qing v\u00e0o n\u0103m 1789. N\u0103m \u0111\u00f3 l\u00e0 th\u1ebf k\u1ef7 n\u00e0o?<\/p>\n<p dir=\"ltr\">b) k\u1ef7 ni\u1ec7m 600 n\u0103m ng\u00e0y sinh c\u1ee7a Nguyen Trai \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0o n\u0103m 1980. Nguy\u1ec5n Trai sinh n\u0103m n\u00e0o? Th\u1ebf k\u1ef7 n\u00e0o trong n\u0103m \u0111\u00f3?<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">A) Qu\u00e1n Trung Dai \u0111\u00e3 ph\u00e1 v\u1ee1 Qu\u00e2n \u0111\u1ed9i Thanh n\u0103m 1789. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7 th\u1ee9 m\u01b0\u1eddi t\u00e1m (th\u1ebf k\u1ef7 th\u1ee9 m\u01b0\u1eddi t\u00e1m).<\/p>\n<p dir=\"ltr\">b) k\u1ef7 ni\u1ec7m 600 n\u0103m ng\u00e0y sinh c\u1ee7a Nguy\u1ec5n Trai \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0o n\u0103m 1980. Do \u0111\u00f3, Nguyen Trai sinh: 1980 &#8211; 600 = 1380.<\/p>\n<p dir=\"ltr\">N\u0103m \u0111\u00f3 v\u00e0o th\u1ebf k\u1ef7 th\u1ee9 m\u01b0\u1eddi b\u1ed1n (th\u1ebf k\u1ef7 XIV).<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 26 B\u00e0i 4:<\/p>\n<p dir=\"ltr\">Trong cu\u1ed9c thi 600m, NAM ch\u1ea1y trong 1\/4 ph\u00fat, B\u00ecnh ch\u1ea1y trong 1\/5 ph\u00fat. H\u1ecfi ai ch\u1ea1y nhanh h\u01a1n v\u00e0 nhanh h\u01a1n v\u00e0i gi\u00e2y?<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i c\u00f3:<\/p>\n<p dir=\"ltr\">1\/4 ph\u00fat = 15 gi\u00e2y<\/p>\n<p dir=\"ltr\">1\/5 ph\u00fat = 12 gi\u00e2y<\/p>\n<p dir=\"ltr\">V\u00ec 12 gi\u00e2y &lt;15 gi\u00e2y<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, Binh ch\u1ea1y nhanh h\u01a1n Nam. V\u00e0 nhanh h\u01a1n s\u1ed1 th\u1ee9 hai: 15 &#8211; 12 = 3 gi\u00e2y Tr\u1ea3 l\u1eddi: 3 gi\u00e2y<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">B\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 \u1edf trang 26 B\u00e0i 5:<\/p>\n<p dir=\"ltr\">Khoanh tr\u00f2n t\u1eeb tr\u01b0\u1edbc c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang:<\/p>\n<p dir=\"ltr\">a) Ch\u1ec9 \u0111\u1ed3ng h\u1ed3<\/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\/toan-lop-4-giay-the-ki-3.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">A. 9 gi\u1edd 8 ph\u00fat<\/p>\n<p dir=\"ltr\">B. 8 gi\u1edd 40 ph\u00fat<\/p>\n<p dir=\"ltr\">C. 8 gi\u1edd 45 ph\u00fat<\/p>\n<p dir=\"ltr\">D. 9 gi\u1edd 40 ph\u00fat<\/p>\n<p dir=\"ltr\">b) 5kg 8g =?<\/p>\n<p dir=\"ltr\">A. 58g<\/p>\n<p dir=\"ltr\">B. 508g<\/p>\n<p dir=\"ltr\">C. 5008g<\/p>\n<p dir=\"ltr\">D. 580g<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">A) \u0110\u1ed3ng h\u1ed3 ch\u1ec9 8 gi\u1edd 40 ph\u00fat.<\/p>\n<p dir=\"ltr\">V\u00f2ng tr\u00f2n B.<\/p>\n<p dir=\"ltr\">b) Ch\u00fang t\u00f4i c\u00f3: 1kg = 1000g v\u00ec v\u1eady 5kg = 5000g.<\/p>\n<p dir=\"ltr\">Do \u0111\u00f3: 5kg 8g = 5kg + 8g = 5000g + 8g = 5008g.<\/p>\n<p dir=\"ltr\">V\u1eady: 5kg 8g = 5008g.<\/p>\n<p dir=\"ltr\">V\u00f2ng tr\u00f2n C.<\/p>\n<p dir=\"ltr\">\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_bai_tap_toan_trong_the_ky_thu_hai_da_mo_rong_toan_hoc_lop_4_de_ho_thuc_hanh_ban_than\"><\/span>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n trong th\u1ebf k\u1ef7 th\u1ee9 hai \u0111\u00e3 m\u1edf r\u1ed9ng to\u00e1n h\u1ecdc l\u1edbp 4 \u0111\u1ec3 h\u1ecd th\u1ef1c h\u00e0nh b\u1ea3n th\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ngo\u00e0i c\u00e1c b\u00e0i t\u1eadp trong s\u00e1ch gi\u00e1o khoa to\u00e1n h\u1ecdc l\u1edbp 4, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp m\u1edf r\u1ed9ng v\u1ec1 th\u1ebf k\u1ef7 \u0111\u1ec3 b\u1ea1n tham kh\u1ea3o v\u00e0 t\u1ef1 l\u01b0u tr\u1eef hi\u1ec7u qu\u1ea3:<\/p>\n<p dir=\"ltr\">B\u00e0i 1. \u0110i\u1ec1n v\u00e0o d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a) 1\/4 gi\u1edd = &#8230; ph\u00fat<\/p>\n<p dir=\"ltr\">b) 1\/5 gi\u1edd = &#8230; ph\u00fat<\/p>\n<p dir=\"ltr\">c) 2 gi\u1edd 10 ph\u00fat = &#8230; ph\u00fat<\/p>\n<p dir=\"ltr\">d) 1 gi\u1edd 23 ph\u00fat = Vang. ph\u00fat.<\/p>\n<p dir=\"ltr\">B\u00e0i 2.<\/p>\n<p dir=\"ltr\">A) 1\/3 c\u1ee7a 4 ph\u00fat l\u00e0 g\u00ec?<\/p>\n<p dir=\"ltr\">b) 1\/4 c\u1ee7a 3 ph\u00fat l\u00e0 g\u00ec?<\/p>\n<p dir=\"ltr\">c) Bao nhi\u00eau gi\u00e2y 1\/5 c\u1ee7a 2 ph\u00fat?<\/p>\n<p dir=\"ltr\">B\u00e0i 3.<\/p>\n<p dir=\"ltr\">a) 62 gi\u00e2y = &#8230; ph\u00fat &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">b) 75 gi\u00e2y = &#8230; ph\u00fat &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">c) 130 gi\u00e2y = &#8230; ph\u00fat &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">d) 123 gi\u00e2y = &#8230; ph\u00fat &#8230; gi\u00e2y<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 4. Vi\u1ebft s\u1ed1 La M\u00e3 trong d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">a) Trong 91 th\u1ebf k\u1ef7 &#8230;<\/p>\n<p dir=\"ltr\">b) v\u00e0o n\u0103m 1456 trong th\u1ebf k\u1ef7 &#8230;.<\/p>\n<p dir=\"ltr\">c) 547 trong th\u1ebf k\u1ef7 &#8230;<\/p>\n<p dir=\"ltr\">d) 1901 trong th\u1ebf k\u1ef7 &#8230;<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 5. B\u1ed1n l\u1edbp A, B, C, D, l\u1ea7n l\u01b0\u1ee3t, c\u00f3 34 h\u1ecdc sinh, 31 ng\u01b0\u1eddi b\u1ea1n, 36 ng\u01b0\u1eddi b\u1ea1n, 39 ng\u01b0\u1eddi b\u1ea1n. H\u1ecfi c\u00f3 bao nhi\u00eau b\u1ea1n m\u1ed7i l\u1edbp?<\/p>\n<p dir=\"ltr\">B\u00e0i 6. Ba l\u1edbp quy\u00ean g\u00f3p m\u00e1y t\u00ednh x\u00e1ch tay. L\u1edbp 4A \u0111\u00f3ng g\u00f3p 40 m\u00e1y t\u00ednh x\u00e1ch tay, L\u1edbp 4B \u0111\u00f3ng g\u00f3p h\u01a1n 4A L\u1edbp l\u00e0 10 t\u1eadp nh\u01b0ng d\u01b0\u1edbi 4C L\u1edbp l\u00e0 4 cu\u1ed1n s\u00e1ch. H\u1ecfi trung b\u00ecnh c\u00f3 bao nhi\u00eau m\u00e1y t\u00ednh x\u00e1ch tay m\u1ed7i l\u1edbp?<\/p>\n<p dir=\"ltr\">B\u00e0i 7. C\u00f3 6 chi\u1ebfc xe ch\u1edf g\u1ea1o, bao g\u1ed3m 2 chi\u1ebfc xe m\u1ed7i chi\u1ebfc mang theo 24 nh\u00f3m g\u1ea1o, c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n c\u00f2n l\u1ea1i m\u1ed7i chi\u1ebfc mang theo 18 nh\u00f3m g\u1ea1o. H\u1ecfi c\u00f3 bao nhi\u00eau t\u1ea5n g\u1ea1o m\u1ed7i chi\u1ebfc xe?<\/p>\n<p dir=\"ltr\">B\u00e0i 8. T\u00ecm s\u1ed1 l\u01b0\u1ee3ng trung b\u00ecnh c\u1ee7a h\u00e0ng ch\u1ee5c s\u1ed1 t\u1eeb 10 \u0111\u1ebfn 90<\/p>\n<p dir=\"ltr\">B\u00e0i 9. Trung b\u00ecnh c\u1ee7a hai s\u1ed1 l\u00e0 16.<\/p>\n<p dir=\"ltr\">B\u00e0i 10: Trong cu\u1ed9c thi b\u01a1i 100m, Ha b\u01a1i t\u1ea5t c\u1ea3 1\/5 ph\u00fat v\u00e0 LAN b\u01a1i t\u1ea5t c\u1ea3 1\/6 ph\u00fat. H\u1ecfi trong hai b\u1ea1n, ai b\u01a1i nhanh h\u01a1n v\u00e0 nhanh h\u01a1n bao nhi\u00eau gi\u00e2y?<\/p>\n<p dir=\"ltr\">B\u00e0i 11: \u0110i\u1ec1n v\u00e0o s\u1ed1 th\u00edch h\u1ee3p trong d\u1ea5u ch\u1ea5m:<\/p>\n<p dir=\"ltr\">A) Th\u1ebf k\u1ef7 15 b\u1eaft \u0111\u1ea7u t\u1eeb n\u0103m &#8230; \u0111\u1ebfn cu\u1ed1i n\u0103m &#8230; ..<\/p>\n<p dir=\"ltr\">b) \u00d4ng La Font-Ten \u0111\u00e3 ch\u1ebft n\u0103m 1695. N\u0103m \u0111\u00f3 l\u00e0 v\u00e0o th\u1ebf k\u1ef7<\/p>\n<p dir=\"ltr\">c) Chi\u1ebfn th\u1eafng c\u1ee7a Dien Bien Phu n\u0103m 1954. N\u0103m \u0111\u00f3 thu\u1ed9c v\u1ec1 th\u1ebf k\u1ef7.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_de_giup_tre_hoc_toan_4_giay_trong_the_ky_mot_cach_hieu_qua\"><\/span>B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc to\u00e1n 4 gi\u00e2y trong th\u1ebf k\u1ef7 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap tr\u1ebb d\u1ec5 d\u00e0ng h\u1ecdc h\u1ecfi, ti\u1ebfp thu v\u00e0 \u00e1p d\u1ee5ng ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 th\u1ebf k\u1ef7 to\u00e1n l\u1edbp 4, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00ed m\u1eadt hi\u1ec7u qu\u1ea3:<\/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\/toan-lop-4-giay-the-ki-4.jpg\" alt=\"Th\u1ef1c h\u00e0nh tr\u1ebb em th\u01b0\u1eddng xuy\u00ean l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">L\u00e0m ch\u1ee7 l\u00fd thuy\u1ebft: \u0110\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp ho\u1eb7c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, \u0111\u00f2i h\u1ecfi tr\u1ebb ph\u1ea3i l\u00e0m ch\u1ee7 l\u00fd thuy\u1ebft nh\u01b0 th\u1ee9 hai l\u00e0 g\u00ec, th\u1ebf k\u1ef7 l\u00e0 g\u00ec? L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 thay \u0111\u1ed5i c\u00e1c \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng &#8230; n\u1ebfu em b\u00e9 qu\u00ean ho\u1eb7c kh\u00f4ng hi\u1ec3u, cha m\u1eb9 n\u00ean h\u1ed7 tr\u1ee3, h\u01b0\u1edbng d\u1eabn v\u00e0 c\u1ee7ng c\u1ed1 ki\u1ebfn \u200b\u200bth\u1ee9c c\u1ee7a con c\u00e1i h\u1ecd ngay l\u1eadp t\u1ee9c.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u1ee8ng d\u1ee5ng to\u00e1n h\u1ecdc v\u1edbi th\u1ef1c ti\u1ec5n: V\u1edbi \u0111\u01a1n v\u1ecb, th\u1ebf k\u1ef7, trong th\u1ef1c t\u1ebf c\u00f3 r\u1ea5t nhi\u1ec1u nh\u01b0 xem \u0111\u1ed3ng h\u1ed3, xem c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh l\u1ecbch s\u1eed &#8230; \u0111\u1ec3 tr\u1ebb em d\u1ec5 d\u00e0ng h\u00ecnh dung, ghi nh\u1edb v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ed5 ch\u1ee9c c\u00e1c tr\u00f2 ch\u01a1i to\u00e1n h\u1ecdc: \u0110\u1ec3 t\u1ea1o ra s\u1ef1 ph\u1ea5n kh\u00edch cho tr\u1ebb khi h\u1ecdc to\u00e1n, ph\u1ee5 huynh c\u00f3 th\u1ec3 ngh\u0129 v\u1ec1 c\u00e1c tr\u00f2 ch\u01a1i li\u00ean quan \u0111\u1ebfn vi\u1ec7c xem, t\u00ednh to\u00e1n th\u1eddi gian &#8230; k\u1ebft h\u1ee3p v\u1edbi \u0111i\u1ec1u \u0111\u00f3, n\u00ean c\u00f3 nhi\u1ec1u qu\u00e0 t\u1eb7ng \u0111\u1ec3 khuy\u1ebfn kh\u00edch v\u00e0 khuy\u1ebfn kh\u00edch n\u1ebfu con c\u00e1i ch\u01a1i \u0111\u1ec3 gi\u00e0nh chi\u1ebfn th\u1eafng \u0111\u1ec3 tr\u1edf n\u00ean tinh th\u1ea7n v\u00e0 ch\u01a1i h\u01a1n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ef1c h\u00e0nh xuy\u00ean su\u1ed1t: \u0110\u1ec3 tr\u00e1nh vi\u1ec7c h\u1ecdc tr\u1ebb tr\u01b0\u1edbc, ph\u1ee5 huynh n\u00ean khuy\u1ebfn kh\u00edch v\u00e0 y\u00eau c\u1ea7u con c\u00e1i th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n th\u00f4ng qua b\u00e0i t\u1eadp v\u1ec1 nh\u00e0 tr\u00ean s\u00e1ch gi\u00e1o khoa, b\u00e0i t\u1eadp, t\u00ecm hi\u1ec3u th\u00eam tr\u00ean internet, chu\u1ea9n b\u1ecb thi &#8230;<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9: t\u00edch h\u1ee3p t\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7n \u0111\u1ea1i nh\u01b0 gi\u1ea3ng d\u1ea1y th\u00f4ng qua video, ho\u1ea1t h\u00ecnh h\u00e0i h\u01b0\u1edbc \u0111\u1ec3 gi\u00fap tr\u1ebb \u00edt ch\u00e1n, d\u1ea1y qua c\u00e1c tr\u00f2 ch\u01a1i, s\u00e1ch b\u1ed5 sung &#8230;. \u0110\u00f3 l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u00fap tr\u1ebb em c\u00f3 h\u1ee9ng th\u00fa, \u0111am m\u00ea v\u00e0 ph\u00e1t tri\u1ec3n suy ngh\u0129 khi h\u1ecdc to\u00e1n nhi\u1ec1u h\u01a1n v\u00e0 \u1ee9ng d\u1ee5ng to\u00e1n h\u1ecdc. Ph\u1ee5 huynh c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c \u1ee9ng d\u1ee5ng video sau \u0111\u00e2y ho\u1eb7c \u0111\u0103ng k\u00fd h\u1ed7 tr\u1ee3 t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"> <img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/nhantuvanmienphi.png\" alt=\"\" width=\"200\" height=\"39\"><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><a href=\"https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS<\/a><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ket_luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 vi\u1ec7c chia s\u1ebb ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc 4 gi\u00e2y trong th\u1ebf k\u1ef7, m\u1ed9t ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong su\u1ed1t ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y \u0111\u1ec3 th\u1ef1c h\u00e0nh. Hy v\u1ecdng r\u1eb1ng, v\u1edbi th\u00f4ng tin tr\u00ean s\u1ebd gi\u00fap cha m\u1eb9, c\u0169ng nh\u01b0 tr\u1ebb c\u00f3 nhi\u1ec1u t\u00e0i li\u1ec7u gi\u1ea3ng d\u1ea1y v\u00e0 to\u00e1n h\u1ecdc h\u01a1n m\u1ed9t c\u00e1ch t\u1ed1t h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nghi\u00ean c\u1ee9u to\u00e1n h\u1ecdc 4 gi\u00e2y trong th\u1ebf k\u1ef7 l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n, kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong to\u00e1n h\u1ecdc m\u00e0 c\u00f2n li\u00ean quan \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 th\u1eddi gian th\u1ef1c t\u1ebf. V\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc t\u1ed1t v\u1ec1 ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e0y, Kh\u1ec9 s\u1ebd t\u00f3m t\u1eaft c\u00e1c m\u1eb9o v\u00e0&#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-15022","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15022","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=15022"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15022\/revisions"}],"predecessor-version":[{"id":18059,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15022\/revisions\/18059"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=15022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=15022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=15022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}