{"id":38052,"date":"2026-09-27T15:18:31","date_gmt":"2026-09-27T13:18:31","guid":{"rendered":"https:\/\/ludorex.com\/?p=38052"},"modified":"2026-09-27T15:19:39","modified_gmt":"2026-09-27T13:19:39","slug":"boi-so-cua-9","status":"publish","type":"post","link":"https:\/\/ludorex.com\/vi\/tro-choi\/boi-so-cua-9","title":{"rendered":"B\u1ed9i s\u1ed1 c\u1ee7a 9: \u0111\u1ed1 vui \u00f4n b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"38052\" class=\"elementor elementor-38052\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b6d5809 e-flex e-con-boxed e-con e-parent\" data-id=\"2b6d5809\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-51b9df9 elementor-widget elementor-widget-spacer\" data-id=\"51b9df9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-36e44969 e-con-full e-flex e-con e-parent\" data-id=\"36e44969\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-42b16f56 e-con-full e-flex e-con e-child\" data-id=\"42b16f56\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-387d4e4c e-con-full e-flex e-con e-child\" data-id=\"387d4e4c\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;video&quot;,&quot;background_video_start&quot;:0,&quot;background_video_end&quot;:10,&quot;background_play_on_mobile&quot;:&quot;yes&quot;,&quot;background_privacy_mode&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25e1d305 elementor-widget elementor-widget-image\" data-id=\"25e1d305\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9.jpg\" class=\"attachment-thumbnail size-thumbnail wp-image-38048\" alt=\"C\u00e2u h\u1ecfi trong tr\u00f2 ch\u01a1i b\u1ed9i s\u1ed1 c\u1ee7a 9 hi\u1ec3n th\u1ecb ph\u00e9p chia ? \u00f7 9 = 7 v\u1edbi hai \u0111\u00e1p \u00e1n 63 v\u00e0 48 trong c\u00e1c \u00f4 m\u00e0u.\" srcset=\"https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9.jpg 150w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-12x12.jpg 12w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-40x40.jpg 40w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-64x64.jpg 64w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-24x24.jpg 24w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-36x36.jpg 36w, https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9-48x48.jpg 48w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a496156 elementor-widget elementor-widget-icon-box\" data-id=\"4a496156\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<h1 class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tB\u1ed9i s\u1ed1 c\u1ee7a 9: \u0111\u1ed1 vui \u00f4n b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h1>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65c6db6a elementor-align-center elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"65c6db6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjM4MDUwIiwidG9nZ2xlIjpmYWxzZX0%3D\" rel=\"nofollow\" id=\"btnFullscreen\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-play\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M424.4 214.7L72.4 6.6C43.8-10.3 0 6.1 0 47.9V464c0 37.5 40.7 60.1 72.4 41.3l352-208c31.4-18.5 31.5-64.1 0-82.6z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Ch\u01a1i<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6b5a5db0 e-con-full e-flex e-con e-child\" data-id=\"6b5a5db0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-757cc055 e-flex e-con-boxed e-con e-parent\" data-id=\"757cc055\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-39e54949 e-con-full e-flex e-con e-child\" data-id=\"39e54949\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-290f63f0 elementor-widget elementor-widget-icon-box\" data-id=\"290f63f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<p class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tB\u1ed9i s\u1ed1 c\u1ee7a 9: \u0111\u1ed1 vui \u00f4n b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-561f13f7 e-con-full e-flex e-con e-child\" data-id=\"561f13f7\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<main class=\"elementor-element elementor-element-4933ecd2 e-flex e-con-boxed e-con e-parent\" data-id=\"4933ecd2\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-1adc315 e-con-full e-flex e-con e-child\" data-id=\"1adc315\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e7abcd9 elementor-widget elementor-widget-breadcrumbs\" data-id=\"e7abcd9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"breadcrumbs.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p id=\"breadcrumbs\"><span><span><a href=\"https:\/\/ludorex.com\/vi\">Tr\u00f2 ch\u01a1i<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2214f91c elementor-share-buttons--view-icon elementor-share-buttons--shape-circle elementor-share-buttons--skin-gradient elementor-grid-0 elementor-share-buttons--color-official elementor-widget elementor-widget-share-buttons\" data-id=\"2214f91c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"share-buttons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-grid\" role=\"list\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_facebook\" role=\"button\" tabindex=\"0\" aria-label=\"Share on facebook\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-facebook\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256c0 123.78 90.69 226.38 209.25 245V327.69h-63V256h63v-54.64c0-62.15 37-96.48 93.67-96.48 27.14 0 55.52 4.84 55.52 4.84v61h-31.28c-30.8 0-40.41 19.12-40.41 38.73V256h68.78l-11 71.69h-57.78V501C413.31 482.38 504 379.78 504 256z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_whatsapp\" role=\"button\" tabindex=\"0\" aria-label=\"Share on whatsapp\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-whatsapp\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M380.9 97.1C339 55.1 283.2 32 223.9 32c-122.4 0-222 99.6-222 222 0 39.1 10.2 77.3 29.6 111L0 480l117.7-30.9c32.4 17.7 68.9 27 106.1 27h.1c122.3 0 224.1-99.6 224.1-222 0-59.3-25.2-115-67.1-157zm-157 341.6c-33.2 0-65.7-8.9-94-25.7l-6.7-4-69.8 18.3L72 359.2l-4.4-7c-18.5-29.4-28.2-63.3-28.2-98.2 0-101.7 82.8-184.5 184.6-184.5 49.3 0 95.6 19.2 130.4 54.1 34.8 34.9 56.2 81.2 56.1 130.5 0 101.8-84.9 184.6-186.6 184.6zm101.2-138.2c-5.5-2.8-32.8-16.2-37.9-18-5.1-1.9-8.8-2.8-12.5 2.8-3.7 5.6-14.3 18-17.6 21.8-3.2 3.7-6.5 4.2-12 1.4-32.6-16.3-54-29.1-75.5-66-5.7-9.8 5.7-9.1 16.3-30.3 1.8-3.7.9-6.9-.5-9.7-1.4-2.8-12.5-30.1-17.1-41.2-4.5-10.8-9.1-9.3-12.5-9.5-3.2-.2-6.9-.2-10.6-.2-3.7 0-9.7 1.4-14.8 6.9-5.1 5.6-19.4 19-19.4 46.3 0 27.3 19.9 53.7 22.6 57.4 2.8 3.7 39.1 59.7 94.8 83.8 35.2 15.2 49 16.5 66.6 13.9 10.7-1.6 32.8-13.4 37.4-26.4 4.6-13 4.6-24.1 3.2-26.4-1.3-2.5-5-3.9-10.5-6.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_x-twitter\" role=\"button\" tabindex=\"0\" aria-label=\"Share on x-twitter\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-x-twitter\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t\t<div class=\"elementor-share-btn elementor-share-btn_reddit\" role=\"button\" tabindex=\"0\" aria-label=\"Share on reddit\" data-no-translation-aria-label=\"\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-reddit\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M201.5 305.5c-13.8 0-24.9-11.1-24.9-24.6 0-13.8 11.1-24.9 24.9-24.9 13.6 0 24.6 11.1 24.6 24.9 0 13.6-11.1 24.6-24.6 24.6zM504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zm-132.3-41.2c-9.4 0-17.7 3.9-23.8 10-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3 55.4 12.5c0 13.6 11.1 24.6 24.6 24.6 13.8 0 24.9-11.3 24.9-24.9s-11.1-24.9-24.9-24.9c-9.7 0-18 5.8-22.1 13.8l-61.2-13.6c-3-.8-6.1 1.4-6.9 4.4l-19.1 86.4c-33.2 1.4-63.1 11.3-85.5 26.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9 0-46.3 46.9-14.4 62.8-1.1 5-1.7 10.2-1.7 15.5 0 52.6 59.2 95.2 132 95.2 73.1 0 132.3-42.6 132.3-95.2 0-5.3-.6-10.8-1.9-15.8 31.3-16 19.8-62.5-14.9-62.5zM302.8 331c-18.2 18.2-76.1 17.9-93.6 0-2.2-2.2-6.1-2.2-8.3 0-2.5 2.5-2.5 6.4 0 8.6 22.8 22.8 87.3 22.8 110.2 0 2.5-2.2 2.5-6.1 0-8.6-2.2-2.2-6.1-2.2-8.3 0zm7.7-75c-13.6 0-24.6 11.1-24.6 24.9 0 13.6 11.1 24.6 24.6 24.6 13.8 0 24.9-11.1 24.9-24.6 0-13.8-11-24.9-24.9-24.9z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ca34cff elementor-widget elementor-widget-text-editor\" data-id=\"4ca34cff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>V\u1ec1 Tr\u00f2 Ch\u01a1i<\/h2><p>V\u1edbi tr\u00f2 \u0111\u1ed1 vui v\u1ec1 <strong>b\u1ed9i s\u1ed1 c\u1ee7a 9<\/strong> b\u1ea1n s\u1ebd \u00f4n b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9 theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i, t\u1ee9c l\u00e0 qua c\u00e1c ph\u00e9p chia. M\u1ed7i c\u00e2u h\u1ecfi hi\u1ec7n m\u1ed9t ph\u00e9p t\u00ednh c\u00f2n thi\u1ebfu nh\u01b0 <strong>? \u00f7 9 = 7<\/strong> v\u00e0 b\u1ea1n ph\u1ea3i ch\u1ecdn s\u1ed1 c\u00f2n thi\u1ebfu trong v\u00e0i \u0111\u00e1p \u00e1n. \u0110\u00e1p \u00e1n lu\u00f4n l\u00e0 m\u1ed9t b\u1ed9i s\u1ed1 c\u1ee7a 9 (\u1edf \u0111\u00e2y l\u00e0 63), n\u00ean m\u1ed7i c\u00e2u \u0111\u00fang gi\u00fap c\u1ee7ng c\u1ed1 b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9 t\u1eeb m\u1ed9t g\u00f3c nh\u00ecn kh\u00e1c. N\u1ebfu mu\u1ed1n ti\u1ebfp t\u1ee5c luy\u1ec7n con s\u1ed1 n\u00e0y theo c\u00e1ch kh\u00e1c, h\u00e3y xem c\u00e1c tr\u00f2 ch\u01a1i v\u1ec1 <span style=\"text-decoration: underline; color: #000080;\"><a style=\"color: #000080;\" href=\"https:\/\/ludorex.com\/vi\/tag\/bang-cuu-chuong-10\"><strong><span style=\"color: #000080; text-decoration: underline;\">b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9<\/span><\/strong><\/a><\/span>.<\/p><p>Nh\u1eefng <strong>b\u1ed9i s\u1ed1 c\u1ee7a 9<\/strong> \u0111\u1ea7u ti\u00ean l\u00e0: <strong>9, 18, 27, 36, 45, 54, 63, 72, 81 v\u00e0 90<\/strong>. Ch\u00fang c\u00f3 m\u1ed9t t\u00ednh ch\u1ea5t g\u1ea7n nh\u01b0 k\u1ef3 di\u1ec7u m\u00e0 kh\u00f4ng s\u1ed1 n\u00e0o kh\u00e1c trong b\u1ea3ng c\u00f3 \u0111\u01b0\u1ee3c, v\u00e0 n\u00f3 s\u1ebd gi\u00fap b\u1ea1n tr\u1ea3 l\u1eddi nhanh h\u01a1n.<\/p><h2>C\u00e1ch ch\u01a1i B\u1ed9i s\u1ed1 c\u1ee7a 9 nh\u01b0 th\u1ebf n\u00e0o?<\/h2><ol><li>\u0110\u1ecdc ph\u00e9p chia tr\u00ean m\u00e0n h\u00ecnh: ch\u1ed7 tr\u1ed1ng l\u00e0 s\u1ed1 b\u1ecb chia.<\/li><li>H\u00e3y ngh\u0129 ng\u01b0\u1ee3c l\u1ea1i: s\u1ed1 b\u1ea1n c\u1ea7n t\u00ecm l\u00e0 <strong>9 \u00d7 k\u1ebft qu\u1ea3<\/strong>.<\/li><li>B\u1ea5m v\u00e0o \u00f4 c\u00f3 \u0111\u00e1p \u00e1n \u0111\u00fang.<\/li><li>Chuy\u1ec3n sang c\u00e2u ti\u1ebfp theo v\u00e0 c\u1ed1 g\u1eafng tr\u1ea3 l\u1eddi \u0111\u00fang t\u1ea5t c\u1ea3.<\/li><\/ol><h2>\u0110i\u1ec1u khi\u1ec3n<\/h2><h3>PC<\/h3><ul><li><strong>Nh\u1ea5p chu\u1ed9t:<\/strong> <strong>ch\u1ecdn \u0111\u00e1p \u00e1n<\/strong><\/li><\/ul><h3>\u0110i\u1ec7n tho\u1ea1i v\u00e0 m\u00e1y t\u00ednh b\u1ea3ng<\/h3><ul><li><strong>Ch\u1ea1m m\u00e0n h\u00ecnh:<\/strong> <strong>ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang<\/strong><\/li><\/ul><h2>H\u1ecdc \u0111\u01b0\u1ee3c g\u00ec?<\/h2><ul><li>Ghi nh\u1edb <strong>b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9<\/strong> v\u00e0 nh\u1eadn ra k\u1ebft qu\u1ea3 ch\u1ec9 trong nh\u00e1y m\u1eaft.<\/li><li>Hi\u1ec3u <strong>ph\u00e9p chia l\u00e0 ph\u00e9p to\u00e1n ng\u01b0\u1ee3c<\/strong> c\u1ee7a ph\u00e9p nh\u00e2n.<\/li><li>C\u00e1i <strong>quy t\u1eafc chia h\u1ebft cho 9<\/strong>, c\u0169ng h\u1eefu \u00edch v\u1edbi s\u1ed1 l\u1edbn.<\/li><li>Nhanh nh\u1ea1y trong <strong>t\u00ednh nh\u1ea9m<\/strong>.<\/li><\/ul><p>Ph\u00f9 h\u1ee3p cho tr\u1ebb t\u1eeb 8 tu\u1ed5i.<\/p><h2>M\u1eb9o \u0111\u1ec3 ch\u01a1i t\u1ed1t h\u01a1n<\/h2><ul><li><strong>C\u1ed9ng c\u00e1c ch\u1eef s\u1ed1:<\/strong> \u1edf m\u1ecdi b\u1ed9i s\u1ed1 c\u1ee7a 9, t\u1ed5ng c\u00e1c ch\u1eef s\u1ed1 l\u00e0 9 ho\u1eb7c m\u1ed9t b\u1ed9i s\u1ed1 c\u1ee7a 9. 6 + 3 = 9 n\u00ean 63 h\u1ee3p l\u1ec7; 4 + 8 = 12 n\u00ean lo\u1ea1i 48 m\u00e0 kh\u00f4ng c\u1ea7n t\u00ednh g\u00ec.<\/li><li><strong>M\u1eb9o h\u00e0ng ch\u1ee5c:<\/strong> v\u1edbi 9 \u00d7 7, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c nh\u1ecf h\u01a1n 7 m\u1ed9t \u0111\u01a1n v\u1ecb (l\u00e0 6) v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 s\u1ed1 c\u00f2n thi\u1ebfu \u0111\u1ec3 \u0111\u1ee7 9 (l\u00e0 3): 63.<\/li><li><strong>H\u00e3y \u0111\u1ec3 \u00fd c\u00e1i thang:<\/strong> 09, 18, 27, 36\u2026 h\u00e0ng ch\u1ee5c t\u0103ng d\u1ea7n t\u1eebng \u0111\u01a1n v\u1ecb trong khi h\u00e0ng \u0111\u01a1n v\u1ecb gi\u1ea3m d\u1ea7n t\u1eebng \u0111\u01a1n v\u1ecb.<\/li><li><strong>Nh\u00e2n v\u1edbi 10 r\u1ed3i tr\u1eeb:<\/strong> 9 \u00d7 8 c\u0169ng b\u1eb1ng 80 \u2212 8 = 72.<\/li><\/ul><h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2><h3>B\u1ed9i s\u1ed1 c\u1ee7a 9 l\u00e0 nh\u1eefng s\u1ed1 n\u00e0o?<\/h3><p>T\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 c\u00f3 \u0111\u01b0\u1ee3c khi nh\u00e2n 9 v\u1edbi m\u1ed9t s\u1ed1 nguy\u00ean kh\u00e1c: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108\u2026 Danh s\u00e1ch n\u00e0y l\u00e0 v\u00f4 t\u1eadn.<\/p><h3>L\u00e0m sao bi\u1ebft m\u1ed9t s\u1ed1 c\u00f3 ph\u1ea3i l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 9?<\/h3><p>C\u1ed9ng c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a n\u00f3. N\u1ebfu k\u1ebft qu\u1ea3 l\u00e0 9, 18, 27 ho\u1eb7c b\u1ea5t k\u1ef3 b\u1ed9i s\u1ed1 n\u00e0o kh\u00e1c c\u1ee7a 9 th\u00ec s\u1ed1 \u0111\u00f3 c\u0169ng v\u1eady. V\u00ed d\u1ee5, 738: 7 + 3 + 8 = 18, n\u00ean 738 l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 9.<\/p><h3>B\u1ed9i s\u1ed1 c\u1ee7a 9 c\u00f3 \u0111\u1ed3ng th\u1eddi l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 3 kh\u00f4ng?<\/h3><p>C\u00f3, lu\u00f4n lu\u00f4n, v\u00ec 9 = 3 \u00d7 3. Ng\u01b0\u1ee3c l\u1ea1i th\u00ec kh\u00f4ng \u0111\u00fang: 12 l\u00e0 b\u1ed9i s\u1ed1 c\u1ee7a 3 nh\u01b0ng kh\u00f4ng ph\u1ea3i c\u1ee7a 9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a223bee elementor-widget elementor-widget-text-editor\" data-id=\"a223bee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Th\u00f4ng tin b\u1ed5 sung<\/h2><p><strong>Th\u1ec3 lo\u1ea1i:<\/strong> Gi\u00e1o d\u1ee5c to\u00e1n h\u1ecdc, \u0111\u1ed1 vui<br \/><strong>\u0110\u1ed9 tu\u1ed5i khuy\u1ebfn ngh\u1ecb:<\/strong> T\u1eeb 8 tu\u1ed5i tr\u1edf l\u00ean<br \/><strong>C\u00f4ng ngh\u1ec7:<\/strong> HTML5<br \/><strong>N\u1ec1n t\u1ea3ng:<\/strong> Tr\u00ecnh duy\u1ec7t web (PC, m\u00e1y t\u00ednh b\u1ea3ng v\u00e0 \u0111i\u1ec7n tho\u1ea1i)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-384aecb6 elementor-widget elementor-widget-heading\" data-id=\"384aecb6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">C\u1eadp nh\u1eadt m\u1edbi nh\u1ea5t<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-343c4a31 elementor-align-left elementor-widget elementor-widget-post-info\" data-id=\"343c4a31\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-228f13f elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/2026\/09\/27\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>27 th\u00e1ng 9, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-4358513 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm61.8-104.4l-84.9-61.7c-3.1-2.3-4.9-5.9-4.9-9.7V116c0-6.6 5.4-12 12-12h32c6.6 0 12 5.4 12 12v141.7l66.8 48.6c5.4 3.9 6.5 11.4 2.6 16.8L334.6 349c-3.9 5.3-11.4 6.5-16.8 2.6z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-time\">\n\t\t\t\t\t\t\t\t\t\t<time>3:18 chi\u1ec1u<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5fdb4504 elementor-widget elementor-widget-heading\" data-id=\"5fdb4504\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">T\u00e1c gi\u1ea3:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4e71af elementor-author-box--avatar-yes elementor-author-box--name-yes elementor-author-box--biography-yes elementor-author-box--link-no elementor-widget elementor-widget-author-box\" data-id=\"c4e71af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"author-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-author-box\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/ve-toi\" target=\"_blank\" class=\"elementor-author-box__avatar\">\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/secure.gravatar.com\/avatar\/8ebb79153d837d98bee34a35135159df6b950eb623ae2f21bce22a5ff645bbdb?s=300&#038;d=wavatar&#038;r=g\" alt=\"Picture of Rub\u00e9n Cabra Zamora\" loading=\"lazy\">\n\t\t\t\t<\/a>\n\t\t\t\n\t\t\t<div class=\"elementor-author-box__text\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ludorex.com\/vi\/ve-toi\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-author-box__name\">\n\t\t\t\t\t\t\tRub\u00e9n Cabra Zamora\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-author-box__bio\">\n\t\t\t\t\t\tNg\u01b0\u1eddi s\u00e1ng t\u1ea1o n\u1ed9i dung tr\u00f2 ch\u01a1i \u0111i\u1ec7n t\u1eed | Nh\u00e0 ph\u00e1t tri\u1ec3n web | Gi\u00e1m \u0111\u1ed1c \u0111i\u1ec1u h\u00e0nh Ludorex | Chuy\u00ean gia SEO &amp; AI t\u1ea1i Internet Rep\u00fablica. \u0110am m\u00ea c\u00f4ng ngh\u1ec7 v\u00e0 tr\u00f2 ch\u01a1i \u0111i\u1ec7n t\u1eed, \u0111\u1ed3ng th\u1eddi cam k\u1ebft gi\u00fap c\u00e1c doanh nghi\u1ec7p ph\u00e1t tri\u1ec3n m\u1ea1nh m\u1ebd trong th\u1ebf gi\u1edbi k\u1ef9 thu\u1eadt s\u1ed1.\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7bc19b8f e-con-full elementor-hidden-mobile e-flex e-con e-child\" data-id=\"7bc19b8f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5247f91 elementor-widget elementor-widget-heading\" data-id=\"5247f91\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/ludorex.com\/vi\/tro-choi-nhieu-nguoi-choi\">Qu\u1ea3ng c\u00e1o<\/a><\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cba6447 elementor-widget elementor-widget-image\" 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Nh\u1eefng chi\u1ebfc t\u00e0u ng\u1ea7m, nh\u01b0 b\u00f3ng ma th\u00e9p, len l\u1ecfi gi\u1eefa c\u00e1c ng\u1ecdn s\u00f3ng, th\u00e1p ph\u00e1o h\u01b0\u1edbng v\u1ec1 ph\u00eda ch\u00e2n tr\u1eddi. Ti\u1ebfng \u0111\u1ea1i b\u00e1c vang d\u1ed9i gi\u1eefa nh\u1eefng d\u00e3y n\u00fai s\u1eebng s\u1eefng ph\u00eda xa, nh\u1eefng nh\u00e2n ch\u1ee9ng c\u00e2m l\u1eb7ng c\u1ee7a c\u01a1n th\u1ecbnh n\u1ed9 b\u00f9ng ph\u00e1t. Ng\u01b0 l\u00f4i r\u1ebd n\u01b0\u1edbc, \u0111\u1ec3 l\u1ea1i nh\u1eefng v\u1ec7t bong b\u00f3ng h\u00f2a l\u1eabn v\u1edbi b\u1ecdt s\u00f3ng. 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En cada pregunta aparece una operaci\u00f3n incompleta como ? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":38048,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"yasr_overall_rating":0,"yasr_post_is_review":"","yasr_auto_insert_disabled":"","yasr_review_type":"","footnotes":""},"categories":[695,830,390,391],"tags":[864,879,878,848],"class_list":["post-38052","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-matematicas","category-tablas-de-multiplicar","category-ninos-de-8-a-9-anos","category-ninos-de-9-a-10-anos","tag-calculo-mental","tag-divisiones","tag-multiplicaciones","tag-tabla-del-9"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M\u00faltiplos de 9: concurso para repasar la tabla del 9 - Juegos Gratis Online<\/title>\n<meta name=\"description\" content=\"M\u00faltiplos de 9 en un concurso de divisiones: descubre qu\u00e9 n\u00famero dividido entre 9 da el resultado y aprende el truco de sumar cifras. \u00a1Juega gratis online!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ludorex.com\/vi\/tro-choi\/boi-so-cua-9\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00faltiplos de 9: concurso para repasar la tabla del 9 - Juegos Gratis Online\" \/>\n<meta property=\"og:description\" content=\"M\u00faltiplos de 9 en un concurso de divisiones: descubre qu\u00e9 n\u00famero dividido entre 9 da el resultado y aprende el truco de sumar cifras. \u00a1Juega gratis online!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ludorex.com\/vi\/tro-choi\/boi-so-cua-9\" \/>\n<meta property=\"og:site_name\" content=\"Juegos Gratis Online - Ludorex\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-27T13:18:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-27T13:19:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ludorex.com\/wp-content\/uploads\/2026\/09\/multiplos-de-9.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"150\" \/>\n\t<meta property=\"og:image:height\" content=\"150\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Rub\u00e9n Cabra Zamora\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/x.com\/Ruben_Cabra\/\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rub\u00e9n Cabra Zamora\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"B\u1ed9i s\u1ed1 c\u1ee7a 9: \u0111\u1ed1 vui \u00f4n b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng 9 - Tr\u00f2 ch\u01a1i tr\u1ef1c tuy\u1ebfn mi\u1ec5n ph\u00ed","description":"B\u1ed9i s\u1ed1 c\u1ee7a 9 trong tr\u00f2 \u0111\u1ed1 ph\u00e9p chia: t\u00ecm s\u1ed1 chia cho 9 ra k\u1ebft qu\u1ea3 v\u00e0 h\u1ecdc m\u1eb9o c\u1ed9ng c\u00e1c ch\u1eef s\u1ed1. 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