{"id":20089,"date":"2025-07-07T13:45:06","date_gmt":"2025-07-07T06:45:06","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=20089"},"modified":"2025-07-08T22:35:28","modified_gmt":"2025-07-08T15:35:28","slug":"ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/","title":{"rendered":"L\u00fd thuy\u1ebft v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp to\u00e1n l\u1edbp 2 gi\u1edd ph\u00fat gi\u00e2y \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t hi\u1ec7n nay"},"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\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Cac_khai_niem_ve_don_vi_cua_dong_ho_de_ghi_nho_trong_toan_hoc_lop_2\" >C\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 \u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 ghi nh\u1edb trong to\u00e1n h\u1ecdc l\u1edbp 2<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Don_vi_%E2%80%9Cgio%E2%80%9D_la_gi\" >\u0110\u01a1n v\u1ecb &#8220;gi\u1edd&#8221; l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Don_vi_%E2%80%9Cphut%E2%80%9D_la_gi\" >\u0110\u01a1n v\u1ecb &#8220;ph\u00fat&#8221; l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Don_vi_%E2%80%9Cthu_hai%E2%80%9D_la_gi\" >\u0110\u01a1n v\u1ecb &#8220;th\u1ee9 hai&#8221; l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Mot_so_mau_bai_tap_tu_dao_tao_voi_hoc_sinh_lop_2\" >M\u1ed9t s\u1ed1 m\u1eabu b\u00e0i t\u1eadp t\u1eeb \u0111\u00e0o t\u1ea1o v\u1edbi h\u1ecdc sinh l\u1edbp 2<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Bai_tap_mau_1_Quan_sat_dong_ho_va_tra_loi_dong_ho_chi_vai_gio\" >B\u00e0i t\u1eadp m\u1eabu 1: Quan s\u00e1t \u0111\u1ed3ng h\u1ed3 v\u00e0 tr\u1ea3 l\u1eddi \u0111\u1ed3ng h\u1ed3 ch\u1ec9 v\u00e0i gi\u1edd.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Bai_tap_mau_2_Bai_tap_trac_nghiem_de_xem_tranh_va_chon_cau_tra_loi_trac_nghiem_chinh_xac\" >B\u00e0i t\u1eadp m\u1eabu 2: B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m \u0111\u1ec3 xem tranh v\u00e0 ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi tr\u1eafc nghi\u1ec7m ch\u00ednh x\u00e1c.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Bai_tap_mau_3_Tinh_toan_them_gio\" >B\u00e0i t\u1eadp m\u1eabu 3: T\u00ednh to\u00e1n th\u00eam gi\u1edd.<\/a><\/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\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Bai_tap_4_Choi_tro_choi_ve_thoi_gian\" >B\u00e0i t\u1eadp 4: Ch\u01a1i tr\u00f2 ch\u01a1i v\u1ec1 th\u1eddi gian.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Mot_so_ghi_chu_can_nho_khi_day_tre_em_lop_2_hoc_toan\" >M\u1ed9t s\u1ed1 ghi ch\u00fa c\u1ea7n nh\u1edb khi d\u1ea1y tr\u1ebb em l\u1edbp 2 h\u1ecdc 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-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Ky_thuat_%E2%80%9CNghien_cuu_voi_tre_em%E2%80%9D\" >K\u1ef9 thu\u1eadt &#8220;Nghi\u00ean c\u1ee9u v\u1edbi tr\u1ebb em&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Chia_thoi_gian_hoc_thanh_cac_buoi_ngan\" >Chia th\u1eddi gian h\u1ecdc th\u00e0nh c\u00e1c bu\u1ed5i ng\u1eafn<\/a><\/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\/ly-thuyet-va-cac-dang-bai-tap-toan-lop-2-gio-phut-giay-day-du-nhat-hien-nay\/#Chia_so_luong_kien_%E2%80%8B%E2%80%8Bthuc_duoc_thu_thap\" >Chia s\u1ed1 l\u01b0\u1ee3ng ki\u1ebfn \u200b\u200bth\u1ee9c \u0111\u01b0\u1ee3c thu th\u1eadp<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p dir=\"ltr\">2 -Hour To\u00e1n h\u1ecdc l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc gi\u00fap b\u00e9 d\u1ec5 d\u00e0ng truy c\u1eadp th\u1eddi gian v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf. T\u00ecm hi\u1ec3u v\u1ec1 h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc n\u00e0y, con b\u1ea1n s\u1ebd quen thu\u1ed9c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m th\u1eddi gian c\u01a1 b\u1ea3n nh\u01b0 gi\u1edd, ph\u00fat, gi\u00e2y, &#8230; H\u00e3y t\u00ecm hi\u1ec3u v\u1ec1 h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc v\u00e0 c\u00e1c b\u00e0i t\u1eadp \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf n\u00e0y \u0111\u1ec3 c\u00f3 th\u1ec3 d\u1ea1y ch\u00fang!<\/p>\n<p>                                    <\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_khai_niem_ve_don_vi_cua_dong_ho_de_ghi_nho_trong_toan_hoc_lop_2\"><\/span>C\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 \u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 ghi nh\u1edb trong to\u00e1n h\u1ecdc l\u1edbp 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ea7u ti\u00ean, \u0111\u1ec3 t\u00ecm hi\u1ec3u v\u1ec1 h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc ph\u00fat c\u1ee7a l\u1edbp 2, gi\u00e1o vi\u00ean c\u1ea7n hi\u1ec3u c\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng c\u01a1 b\u1ea3n th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n trong c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y. \u0110\u00f3 l\u00e0 nh\u1eefng \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng, ph\u00fat, gi\u00e2y.<\/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\/1-toan-lop-2-gio-phut.png\" alt=\"M\u1eabu to\u00e1n h\u1ecdc c\u1ea5p 2 theo th\u1eddi gian, ph\u00fat, gi\u00e2y. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Don_vi_%E2%80%9Cgio%E2%80%9D_la_gi\"><\/span>\u0110\u01a1n v\u1ecb &#8220;gi\u1edd&#8221; l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u01a1n v\u1ecb &#8220;gi\u1edd&#8221;, c\u0169ng c\u00f3 t\u00ean ti\u1ebfng Anh &#8220;gi\u1edd&#8221;, vi\u1ebft t\u1eaft l\u00e0 &#8220;H&#8221; l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c suy ra t\u1eeb \u0111\u01a1n v\u1ecb th\u1ee9 hai. M\u1ed9t gi\u1edd l\u00e0 th\u1eddi gian \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i trong 60 ph\u00fat v\u00e0 3600 gi\u00e2y. \u1ede nhi\u1ec1u n\u01a1i, m\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng g\u1ecdi \u0111\u01a1n v\u1ecb ngay b\u00e2y gi\u1edd m\u1ed9t gi\u1edd ho\u1eb7c n\u00f3i \u0111\u1ec3 vi\u1ebft h\u00e0ng ng\u00e0y.<\/p>\n<p dir=\"ltr\">Th\u1eddi gian cho to\u00e1n h\u1ecdc l\u00e0 nh\u01b0 v\u1eady, v\u00e0 trong c\u00e1c ph\u00e9p \u0111o kh\u00e1c, \u0111\u01a1n v\u1ecb hi\u1ec7n c\u00f3 c\u00e1c kh\u00e1i ni\u1ec7m kh\u00e1c. V\u00ed d\u1ee5, theo v\u0129 \u0111\u1ed9, c\u00f3 m\u1ed9t s\u1ef1 kh\u00e1c bi\u1ec7t ng\u1eafn trong c\u00e1c m\u00f9a, c\u00e1c v\u0129 \u0111\u1ed9 kh\u00e1c nhau. Ho\u1eb7c trong h\u1ec7 th\u1ed1ng \u0111\u1ed3ng h\u1ed3 hi\u1ec7n \u0111\u1ea1i, b\u00e2y gi\u1edd \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00e1c \u0111\u01a1n v\u1ecb ph\u00e2n t\u1eed, m\u1ed9t gi\u1edd b\u1eb1ng 3600 gi\u00e2y nguy\u00ean t\u1eed.<\/p>\n<p dir=\"ltr\">Trong khi xem th\u1eddi gian, kh\u00f4ng c\u1ea7n thi\u1ebft ph\u1ea3i xem ch\u00ednh x\u00e1c m\u1ed7i gi\u00e2y nh\u01b0ng c\u00f3 th\u1ec3 \u01b0\u1edbc t\u00ednh ph\u00fat ho\u1eb7c tr\u00f2n, mi\u1ec5n l\u00e0 ng\u01b0\u1eddi xem hi\u1ec3u \u01b0\u1edbc t\u00ednh th\u1eddi gian hi\u1ec7n t\u1ea1i.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Don_vi_%E2%80%9Cphut%E2%80%9D_la_gi\"><\/span>\u0110\u01a1n v\u1ecb &#8220;ph\u00fat&#8221; l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u01a1n v\u1ecb &#8220;ph\u00fat&#8221; c\u00f3 t\u00ean ti\u1ebfng Anh &#8220;ph\u00fat&#8221;. N\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho &#8220;M&#8221; theo ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf ho\u1eb7c &#8220;pH&#8221; ho\u1eb7c &#8220;&#8221; theo Vi\u1ec7t Nam. Trong c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1edbi ph\u00fat l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb trong b\u00e0i t\u1eadp th\u01b0\u1eddng l\u1ea5y bi\u1ec3u t\u01b0\u1ee3ng &#8220;pH&#8221;. V\u00e0 &#8220;&#8221; &#8220;th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb khi \u0111\u1ecdc c\u00e1c s\u1ed1 nh\u01b0&#8221; 10h 30 &#8220;&#8221;.<\/p>\n<p dir=\"ltr\">Trong \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf, m\u1ed9t ph\u00fat l\u00e0 th\u1eddi gian \u0111\u01b0\u1ee3c \u0111o 1\/60 gi\u1edd ho\u1eb7c 60 gi\u00e2y. \u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c suy ra t\u1eeb \u0111\u01a1n v\u1ecb th\u1ee9 hai. T\u1eeb quan \u0111i\u1ec3m c\u1ee7a h\u00ecnh h\u1ecdc, ph\u00fat c\u0169ng l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o g\u00f3c. M\u1ed9t ph\u00fat b\u1eb1ng 1\/60 \u0111\u1ed9 v\u00e0 60 l\u1ea7n.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Don_vi_%E2%80%9Cthu_hai%E2%80%9D_la_gi\"><\/span>\u0110\u01a1n v\u1ecb &#8220;th\u1ee9 hai&#8221; l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u00e2y l\u00e0 \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf \u0111\u01a1n gi\u1ea3n nh\u1ea5t. V\u00e0i gi\u00e2y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft t\u1eaft l\u00e0 &#8220;S&#8221; theo ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf ho\u1eb7c &#8220;GI&#8221; theo ti\u00eau chu\u1ea9n c\u1ee7a Vi\u1ec7t Nam. Bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a \u0111\u01a1n v\u1ecb l\u00e0 &#8220;&#8221; &#8220;.<\/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\/2-toan-lop-2-gio-phut.jpg\" alt=\"Thay \u0111\u1ed5i \u0111\u01a1n v\u1ecb. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Tuy nhi\u00ean, theo \u0111\u1ecbnh ngh\u0129a quen thu\u1ed9c v\u1ec1 ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf, m\u1ed9t gi\u00e2y l\u00e0 th\u1eddi gian l\u00e0 1\/60 ph\u00fat v\u00e0 1\/3600 gi\u1edd. Trong to\u00e1n h\u1ecdc, gi\u00e2y c\u0169ng l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o g\u00f3c, b\u1eb1ng 1\/60 ph\u00fat v\u00e0 b\u1eb1ng 1\/3600 c\u1ee7a m\u1ee9c \u0111\u1ed9. Trong v\u1eadt l\u00fd ph\u00e2n t\u1eed, \u0111\u1ec3 d\u1ec5 d\u00e0ng t\u00ednh to\u00e1n h\u01a1n, m\u1ecdi ng\u01b0\u1eddi c\u0169ng c\u00f3 c\u00e1c \u0111\u01a1n v\u1ecb nh\u1ecf h\u01a1n l\u00e0 mili gi\u00e2y (trong m\u1ed9t ngh\u00ecn gi\u00e2y), micro (trong m\u1ed9t tri\u1ec7u gi\u00e2y) ho\u1eb7c nano gi\u00e2y (b\u1eb1ng m\u1ed9t t\u1ef7 gi\u00e2y).<\/p>\n<p dir=\"ltr\">\u0110\u00e2y l\u00e0 nh\u1eefng kh\u00e1i ni\u1ec7m ban \u0111\u1ea7u t\u1eeb gi\u1edd, ph\u00fat v\u00e0 gi\u00e2y theo c\u00e1c \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng khoa h\u1ecdc \u0111\u1ec3 gi\u00fap ng\u01b0\u1eddi xem c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n. \u1ede c\u1ea5p \u0111\u1ed9 c\u1ee7a tr\u1ebb em l\u1edbp 2, gi\u00e1o vi\u00ean ch\u1ec9 c\u1ea7n \u0111\u1ec3 tr\u1ebb l\u00e0m quen, \u0111\u00e2y l\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb \u0111o th\u1eddi gian c\u01a1 b\u1ea3n v\u00e0 quy t\u1eafc trao \u0111\u1ed5i 1 gi\u1edd t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi 60 ph\u00fat v\u00e0 v\u1edbi 3600 gi\u00e2y l\u00e0 \u0111\u1ee7.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_mau_bai_tap_tu_dao_tao_voi_hoc_sinh_lop_2\"><\/span>M\u1ed9t s\u1ed1 m\u1eabu b\u00e0i t\u1eadp t\u1eeb \u0111\u00e0o t\u1ea1o v\u1edbi h\u1ecdc sinh l\u1edbp 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_mau_1_Quan_sat_dong_ho_va_tra_loi_dong_ho_chi_vai_gio\"><\/span>B\u00e0i t\u1eadp m\u1eabu 1: Quan s\u00e1t \u0111\u1ed3ng h\u1ed3 v\u00e0 tr\u1ea3 l\u1eddi \u0111\u1ed3ng h\u1ed3 ch\u1ec9 v\u00e0i gi\u1edd.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c n\u00e0y, ph\u1ee5 huynh ho\u1eb7c gi\u00e1o vi\u00ean, nh\u1eefng ng\u01b0\u1eddi tr\u1ef1c ti\u1ebfp d\u1ea1y h\u1ecd \u0111\u01b0a ra minh h\u1ecda v\u1ec1 \u0111\u1ed3ng h\u1ed3 tr\u00f2n, kim gi\u1edd v\u00e0 ph\u00fat \u0111ang ch\u1ec9 ra c\u00e1c m\u1ed1c th\u1eddi gian kh\u00e1c nhau v\u00e0 ch\u1ec9 \u0111\u1ec3 h\u1ecd \u0111\u1ecdc 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\/3-toan-lop-2-gio-phut.png\" alt=\"B\u00e0i t\u1eadp to\u00e1n 2 -minute - Quan s\u00e1t \u0111\u1ed3ng h\u1ed3 v\u00e0 tr\u1ea3 l\u1eddi \u0111\u00fang gi\u1edd. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, trong h\u00ecnh minh h\u1ecda n\u00e0y, kim l\u00e0 kim ng\u1eafn h\u01a1n ch\u1ec9 s\u1ed1 2, kim ph\u00fat l\u00e0 kim d\u00e0i h\u01a1n ch\u1ec9 s\u1ed1 12. \u0110\u00f3 l\u00e0, \u0111\u1ed3ng h\u1ed3 ch\u1ec9 l\u00e0 2 gi\u1edd. Ph\u1ee5 huynh, gi\u00e1o vi\u00ean c\u00f3 th\u1ec3 cho em b\u00e9 th\u1ea5y 2 gi\u1edd n\u00e0y.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_mau_2_Bai_tap_trac_nghiem_de_xem_tranh_va_chon_cau_tra_loi_trac_nghiem_chinh_xac\"><\/span>B\u00e0i t\u1eadp m\u1eabu 2: B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m \u0111\u1ec3 xem tranh v\u00e0 ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi tr\u1eafc nghi\u1ec7m ch\u00ednh x\u00e1c.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong b\u00e0i t\u1eadp n\u00e0y, gi\u00e1o vi\u00ean s\u1ebd thi\u1ebft k\u1ebf c\u00e1c c\u00e2u h\u1ecfi theo ki\u1ec3u k\u1ebft n\u1ed1i ho\u1eb7c ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi ch\u00ednh x\u00e1c. Gi\u00e1o vi\u00ean c\u00f3 th\u1ec3 \u0111\u01b0a ra c\u00e1c \u0111i\u1ec1u kho\u1ea3n nh\u01b0 &#8220;tr\u01b0\u1eddng h\u1ecdc sau 11:30&#8221;, k\u00e8m theo nh\u1eefng b\u1ee9c tranh m\u00e0 ch\u1ec9 c\u00f3 th\u1eddi gian cho tr\u1ebb em ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi t\u1ed1t nh\u1ea5t.<\/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\/4-toan-lop-2-gio-phut.png\" alt=\"B\u00e0i t\u1eadp nhi\u1ec1u l\u1ef1a ch\u1ecdn. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Ho\u1eb7c gi\u00e1o vi\u00ean c\u0169ng c\u00f3 th\u1ec3 cung c\u1ea5p nhi\u1ec1u gi\u1edd kh\u00e1c nhau v\u00e0 \u0111\u01b0a ra nhi\u1ec1u b\u00e0i t\u1eadp cho tr\u1ebb em \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u00e0 ch\u1ecdn \u0111\u1ed3ng h\u1ed3 v\u1edbi s\u1ed1 gi\u1edd theo c\u00e1c y\u00eau c\u1ea7u v\u1ea5n \u0111\u1ec1.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_mau_3_Tinh_toan_them_gio\"><\/span>B\u00e0i t\u1eadp m\u1eabu 3: T\u00ednh to\u00e1n th\u00eam gi\u1edd.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c n\u00e0y, ph\u1ee5 huynh v\u00e0 gi\u00e1o vi\u00ean c\u00f3 th\u1ec3 cung c\u1ea5p to\u00e1n h\u1ecdc b\u1ed5 sung c\u01a1 b\u1ea3n v\u1edbi \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n ngay b\u00e2y gi\u1edd. V\u00ed d\u1ee5: t\u00ednh to\u00e1n:<\/p>\n<p dir=\"ltr\">1 gi\u1edd + 2 gi\u1edd =?<\/p>\n<p dir=\"ltr\">5 gi\u1edd &#8211; 3 gi\u1edd =?<\/p>\n<p dir=\"ltr\">8 gi\u1edd + 7 gi\u1edd =?<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_4_Choi_tro_choi_ve_thoi_gian\"><\/span>B\u00e0i t\u1eadp 4: Ch\u01a1i tr\u00f2 ch\u01a1i v\u1ec1 th\u1eddi gian.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c n\u00e0y, ch\u1ee7 y\u1ebfu l\u00e0 gi\u00fap tr\u1ebb em hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1ed9 b\u1ec1n v\u00e0 s\u1ef1 ch\u1eadm ch\u1ea1p c\u1ee7a th\u1eddi gian. Ph\u1ee5 huynh v\u00e0 gi\u00e1o vi\u00ean c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c c\u00e1c tr\u00f2 ch\u01a1i thi \u0111ua cho tr\u1ebb em. K\u00e8m theo c\u00e1c quy t\u1eafc th\u1eddi gian nh\u01b0 ai l\u00e0 ng\u01b0\u1eddi nhanh nh\u1ea5t s\u1ebd gi\u00e0nh chi\u1ebfn th\u1eafng, ho\u1eb7c ai c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec1u y\u00eau c\u1ea7u trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh s\u1ebd \u0111\u01b0\u1ee3c khen th\u01b0\u1edfng.<\/p>\n<p dir=\"ltr\">Xem th\u00eam: L\u00fd thuy\u1ebft v\u00e0 c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp to\u00e1n h\u1ecdc trong \u0111\u01b0\u1eddng th\u1eb3ng c\u1ea5p 2 l\u00e0 ph\u1ed5 bi\u1ebfn<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_ghi_chu_can_nho_khi_day_tre_em_lop_2_hoc_toan\"><\/span>M\u1ed9t s\u1ed1 ghi ch\u00fa c\u1ea7n nh\u1edb khi d\u1ea1y tr\u1ebb em l\u1edbp 2 h\u1ecdc to\u00e1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">B\u00ean c\u1ea1nh vi\u1ec7c l\u00e0m quen v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 to\u00e1n h\u1ecdc ph\u00fat v\u00e0 ph\u00fat, cha m\u1eb9 c\u0169ng n\u00ean ch\u00fa \u00fd \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 t\u00e2m l\u00fd \u1edf tu\u1ed5i c\u1ee7a h\u1ecd. \u1ede tu\u1ed5i 2, n\u00f3 v\u1eabn c\u00f2n kh\u00e1 nh\u1ecf. V\u00ec v\u1eady, l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 h\u1ecdc c\u00e1ch em b\u00e9 c\u1ee7a b\u1ea1n quan t\u00e2m v\u00e0 hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi r\u1ea5t nhi\u1ec1u k\u1ef9 thu\u1eadt v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y trong gi\u00e1o vi\u00ean. <\/p>\n<p dir=\"ltr\">Ph\u1ee5 huynh v\u00e0 gi\u00e1o vi\u00ean c\u00f3 th\u1ec3 nh\u1edb m\u1ed9t s\u1ed1 ghi ch\u00fa sau \u0111\u00e2y \u0111\u1ec3 \u00e1p d\u1ee5ng trong qu\u00e1 tr\u00ecnh d\u1ea1y tr\u1ebb l\u1edbp 2 h\u1ecdc to\u00e1n.<\/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-gio-phut.png\" alt=\"L\u01b0u \u00fd khi d\u1ea1y tr\u1ebb l\u1edbp 2 h\u1ecdc to\u00e1n. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ky_thuat_%E2%80%9CNghien_cuu_voi_tre_em%E2%80%9D\"><\/span>K\u1ef9 thu\u1eadt &#8220;Nghi\u00ean c\u1ee9u v\u1edbi tr\u1ebb em&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u1ede m\u1ed9t \u0111\u1ed9 tu\u1ed5i kh\u00e1 nh\u1ecf, tr\u1ebb em c\u00f3 xu h\u01b0\u1edbng mu\u1ed1n h\u1ecdc v\u00e0 ch\u01a1i v\u1edbi ng\u01b0\u1eddi l\u1edbn. V\u00ec v\u1eady, h\u1ecdc v\u1edbi con b\u1ea1n \u0111\u00f3ng m\u1ed9t vai tr\u00f2 r\u1ea5t quan tr\u1ecdng trong vi\u1ec7c gi\u00fap tr\u1ebb hi\u1ec3u v\u00e0 c\u1ea3m th\u1ea5y g\u1ea7n g\u0169i v\u1edbi to\u00e1n h\u1ecdc. Th\u00f4ng qua c\u00e1c tr\u00f2 ch\u01a1i v\u1edbi tr\u1ebb em, cha m\u1eb9 c\u00f3 th\u1ec3 h\u00f2a nh\u1eadp th\u00e0nh c\u00e1c v\u1ea5n \u0111\u1ec1 \u0111\u1ec3 con c\u00e1i kh\u00f4ng c\u1ea3m th\u1ea5y ch\u00e1n n\u1ea3n v\u00e0 kh\u00f4 khan v\u1edbi ki\u1ebfn \u200b\u200bth\u1ee9c to\u00e1n h\u1ecdc.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Chia_thoi_gian_hoc_thanh_cac_buoi_ngan\"><\/span>Chia th\u1eddi gian h\u1ecdc th\u00e0nh c\u00e1c bu\u1ed5i ng\u1eafn<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Tu\u1ed5i c\u1ee7a em b\u00e9 r\u1ea5t h\u00e1o h\u1ee9c \u0111\u1ec3 h\u1ecdc nh\u01b0ng c\u0169ng r\u1ea5t nhanh ch\u00f3ng b\u1ecb tr\u1ea7m c\u1ea3m. Do \u0111\u00f3, \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 t\u1ed1t nh\u1ea5t, ph\u1ee5 huynh n\u00ean chia th\u1eddi gian h\u1ecdc th\u00e0nh c\u00e1c giai \u0111o\u1ea1n. Xen k\u1ebd n\u00f3 \u0111ang ngh\u1ec9 ng\u01a1i v\u00e0 ch\u01a1i \u0111\u1ec3 em b\u00e9 c\u1ee7a b\u1ea1n s\u1ebd tho\u1ea3i m\u00e1i v\u00e0 th\u00edch h\u1ecdc. 15-20 ph\u00fat l\u00e0 th\u1eddi \u0111i\u1ec3m h\u1ee3p l\u00fd cho m\u1ed9t b\u00e0i h\u1ecdc \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc hi\u1ec7u qu\u1ea3 nh\u1ea5t.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Chia_so_luong_kien_%E2%80%8B%E2%80%8Bthuc_duoc_thu_thap\"><\/span>Chia s\u1ed1 l\u01b0\u1ee3ng ki\u1ebfn \u200b\u200bth\u1ee9c \u0111\u01b0\u1ee3c thu th\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ngay c\u1ea3 ng\u01b0\u1eddi l\u1edbn, t\u1ea3i m\u1ed9t l\u01b0\u1ee3ng l\u1edbn ki\u1ebfn \u200b\u200bth\u1ee9c trong m\u1ed9t nghi\u00ean c\u1ee9u c\u0169ng c\u1ea3m th\u1ea5y ch\u00e1n n\u1ea3n, b\u1ecb x\u00e1o tr\u1ed9n v\u00e0 kh\u00f3 nh\u1edb, t\u00ecnh hu\u1ed1ng n\u00e0y \u1edf tr\u1ebb em kh\u00f4ng k\u1ef3 l\u1ea1 l\u1eafm. Do \u0111\u00f3, \u0111\u1ec3 tr\u1ebb em c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u00fang, h\u1ea5p th\u1ee5 v\u00e0 ghi nh\u1edb k\u1ef9 c\u00e1c b\u00e0i h\u1ecdc, gi\u00e1o vi\u00ean n\u00ean ph\u00e2n chia l\u01b0\u1ee3ng ki\u1ebfn \u200b\u200bth\u1ee9c \u0111\u01b0\u1ee3c thu th\u1eadp trong th\u1eddi gian nghi\u00ean c\u1ee9u.<\/p>\n<\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m v\u00e0 lo\u1ea1i b\u00e0i t\u1eadp to\u00e1n 2 ph\u00fat c\u0169ng nh\u01b0 m\u1ed9t s\u1ed1 ghi ch\u00fa nh\u1ecf gi\u00fap cha m\u1eb9 c\u00f3 th\u1ec3 gi\u00fap con c\u00e1i h\u1ecd duy tr\u00ec n\u0103ng l\u01b0\u1ee3ng t\u00edch c\u1ef1c \u0111\u1ec3 nghi\u00ean c\u1ee9u m\u1ed7i ng\u00e0y. Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y v\u1ec1 to\u00e1n h\u1ecdc l\u1edbp 2 n\u00e0y s\u1ebd cung c\u1ea5p cho m\u1ecdi ng\u01b0\u1eddi ki\u1ebfn \u200b\u200bth\u1ee9c h\u1eefu \u00edch!<\/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>2 -Hour To\u00e1n h\u1ecdc l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc gi\u00fap b\u00e9 d\u1ec5 d\u00e0ng truy c\u1eadp th\u1eddi gian v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf. T\u00ecm hi\u1ec3u v\u1ec1 h\u00ecnh th\u1ee9c to\u00e1n h\u1ecdc n\u00e0y, con b\u1ea1n s\u1ebd quen thu\u1ed9c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m th\u1eddi gian c\u01a1 b\u1ea3n nh\u01b0 gi\u1edd, ph\u00fat, gi\u00e2y, &#8230; H\u00e3y t\u00ecm&#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-20089","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20089","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=20089"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20089\/revisions"}],"predecessor-version":[{"id":25368,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20089\/revisions\/25368"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=20089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=20089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=20089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}