{"id":324,"date":"2022-04-11T05:49:31","date_gmt":"2022-04-11T05:49:31","guid":{"rendered":"http:\/\/2ndclass.deltapublications.in\/?page_id=324"},"modified":"2026-03-24T08:42:24","modified_gmt":"2026-03-24T08:42:24","slug":"s-1-add-and-subtract-numbers-up-to-20","status":"publish","type":"page","link":"https:\/\/2ndclass.deltapublications.in\/index.php\/s-1-add-and-subtract-numbers-up-to-20\/","title":{"rendered":"S.1 Add and subtract numbers up to 20"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Add and subtract numbers up to 20<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-f3aa8cf9a14620e98db7694ccf8dc0e6\" style=\"color:#990707\"><strong>key notes :<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2795 Addition up to 20<\/h2>\n\n\n\n<p>Addition means <strong>putting numbers together<\/strong> to find the total.<\/p>\n\n\n\n<p>Use the <strong>plus sign (+)<\/strong>.<\/p>\n\n\n\n<p>Example: <strong>7 + 5 = 12<\/strong><\/p>\n\n\n\n<p>Count using:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fingers \u270b<\/strong><\/li>\n\n\n\n<li><strong>Objects (blocks, beads)<\/strong><\/li>\n\n\n\n<li><strong>Number line \u27a1\ufe0f<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Start from the <strong>bigger number<\/strong> and count forward.<\/p>\n\n\n\n<p>Practice <strong>number bonds<\/strong> (e.g., 10 + 6 = 16).<\/p>\n\n\n\n<p>Learn simple facts like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>10 + 5 = 15<\/strong><\/li>\n\n\n\n<li><strong>9 + 1 = 10<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2796 Subtraction up to 20<\/h2>\n\n\n\n<p>Subtraction means <strong>taking away<\/strong> or finding how many are left.<\/p>\n\n\n\n<p>Use the <strong>minus sign (\u2212)<\/strong>.<\/p>\n\n\n\n<p>Example: <strong>15 \u2212 6 = 9<\/strong><\/p>\n\n\n\n<p>Use methods:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cross out objects \u274c<\/strong><\/li>\n\n\n\n<li><strong>Count backward \u2b05\ufe0f<\/strong><\/li>\n\n\n\n<li><strong>Number line<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Think: \u201cWhat is left after taking away?\u201d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\ud83d\udd04 Relationship Between Addition &amp; Subtraction<\/h2>\n\n\n\n<p>They are <strong>opposites (inverse operations)<\/strong>.<\/p>\n\n\n\n<p>Example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>8 + 4 = 12<\/strong><\/li>\n\n\n\n<li><strong>12 \u2212 4 = 8<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Helps to <strong>check answers<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\ud83e\udde0 Strategies to Learn Easily<\/h2>\n\n\n\n<p>Use <strong>making 10 strategy<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Example: 8 + 5 \u2192 (8 + 2 = 10, then 10 + 3 = 13)<\/li>\n<\/ul>\n\n\n\n<p>Break numbers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>14 \u2212 6 \u2192 (14 \u2212 4 = 10, then 10 \u2212 2 = 8)<\/li>\n<\/ul>\n\n\n\n<p>Practice <strong>mental math<\/strong> for quick answers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u270f\ufe0f Word Problems<\/h2>\n\n\n\n<p>Look for clue words:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Addition: <strong>total, together, more<\/strong><\/li>\n\n\n\n<li>Subtraction: <strong>left, fewer, take away<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201cRavi has 9 apples and gets 5 more. How many now?\u201d \u2192 <strong>9 + 5 = 14<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center has-text-color has-large-font-size\" style=\"color:#105000\"><strong>Learn with an example<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#f1a9d7\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color has-large-font-size wp-elements-530d3c4a42abfe94859d4aec02d2a5ca\" style=\"color:#b00012\">\ud83c\udf88 Subtract. 14 \u2013 5=_____<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can count back to subtract. Start from 14 and count back 5:<\/li>\n\n\n\n<li>14, 13, 12, 11, 10, 9<\/li>\n\n\n\n<li>14 \u2013 5=9<\/li>\n\n\n\n<li>The difference is 9.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#cdfaba\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color wp-elements-691256ccfef0dde7d0ea889e18f11eec\" style=\"color:#b00012\">\ud83c\udf88Add. 12 + 7=____<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can count up to add. It is easier to start with a larger number. Start from 12 and count up to 7:<\/li>\n\n\n\n<li>12, 13, 14, 15, 16, 17, 18, 19<\/li>\n\n\n\n<li>12 + 7=19<\/li>\n\n\n\n<li>The sum is 19.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#cdd6fe\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color wp-elements-63f0a69f3bee11f05245fc8b478996bf\" style=\"color:#b00012\">\ud83c\udf88 Add: 1 + 1=___<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can count up to add. Start from 1 and count up to 1:<\/li>\n\n\n\n<li>1, 2<\/li>\n\n\n\n<li>1+1= 2<\/li>\n\n\n\n<li>The sum is 2.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-4eb6f8dcdd9dcebf504294d481c38767\" style=\"color:#d90000\">Let&#8217;s practice!\ud83d\udd8a\ufe0f <\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/85959\/757\/913\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-67.png\" alt=\"\" class=\"wp-image-6725\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-67.png 500w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-67-300x300.png 300w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-67-150x150.png 150w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-67-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/85959\/342\/895\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-67.png\" alt=\"\" class=\"wp-image-6726\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-67.png 500w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-67-300x300.png 300w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-67-150x150.png 150w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-67-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Add and subtract numbers up to 20 key notes : \u2795 Addition up to 20 Addition means putting numbers together to find the total. Use the plus sign (+). Example: 7 + 5 = 12 Count using: Start from the bigger number and count forward. Practice number bonds (e.g., 10 + 6 = 16). Learn<a class=\"more-link\" href=\"https:\/\/2ndclass.deltapublications.in\/index.php\/s-1-add-and-subtract-numbers-up-to-20\/\">Continue reading <span class=\"screen-reader-text\">&#8220;S.1 Add and subtract numbers up to 20&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-324","page","type-page","status-publish","hentry","entry"],"_links":{"self":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/324","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=324"}],"version-history":[{"count":12,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/324\/revisions"}],"predecessor-version":[{"id":22947,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/324\/revisions\/22947"}],"wp:attachment":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}