{"id":11041,"date":"2024-05-21T07:30:27","date_gmt":"2024-05-21T07:30:27","guid":{"rendered":"https:\/\/1stclass.deltapublications.in\/?page_id=11041"},"modified":"2025-11-20T05:09:27","modified_gmt":"2025-11-20T05:09:27","slug":"f-3-add-using-doubles-minus-one","status":"publish","type":"page","link":"https:\/\/1stclass.deltapublications.in\/index.php\/f-3-add-using-doubles-minus-one\/","title":{"rendered":"F.3 Add using doubles minus one"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-link-color wp-elements-3800a51db4aeabc4a486c9d361e6ecf2\" style=\"color:#00056d;text-transform:uppercase\"><strong>Add using doubles minus one<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-ec4f666d481dd1268c0d5e044e6cdaeb\" style=\"color:#74008b\"><strong>Key notes<\/strong>:-<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udd22 <strong>What are doubles?<\/strong><\/h3>\n\n\n\n<p>Doubles are when <strong>both numbers are the same<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Example: 4 + 4 = 8 \ud83d\ude0a<\/li>\n\n\n\n<li>Example: 6 + 6 = 12 \ud83c\udf89<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\u2796\u2795 <strong>What is \u201cdoubles minus one\u201d?<\/strong><\/h3>\n\n\n\n<p>When the numbers are <strong>next to each other<\/strong> (like 5 and 6), we use the bigger number\u2019s double and subtract one.<\/p>\n\n\n\n<p>Example: 5 + 6 is close to <strong>6 + 6<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>6 + 6 = 12<\/li>\n\n\n\n<li>12 \u2212 1 = <strong>11<\/strong> \u2714\ufe0f<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83e\udde0 <strong>Why use doubles minus one?<\/strong><\/h3>\n\n\n\n<p>It helps students <strong>add faster<\/strong> using facts they already know.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It is easier to remember doubles! \ud83e\udd29<\/li>\n\n\n\n<li>Then subtract 1 to get the answer.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\u270f\ufe0f <strong>Examples<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>4 + 5 \u2192 Use 5 + 5 = 10 \u2192 10 \u2212 1 = <strong>9<\/strong> \ud83c\udf1f<\/li>\n\n\n\n<li>7 + 6 \u2192 Use 7 + 7 = 14 \u2192 14 \u2212 1 = <strong>13<\/strong> \ud83c\udf3c<\/li>\n\n\n\n<li>9 + 8 \u2192 Use 9 + 9 = 18 \u2192 18 \u2212 1 = <strong>17<\/strong> \ud83c\udf08<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udca1 <strong>When do we use doubles minus one?<\/strong><\/h3>\n\n\n\n<p>Use this strategy when the numbers are <strong>consecutive<\/strong> (next to each other).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>2 and 3<\/li>\n\n\n\n<li>3 and 4<\/li>\n\n\n\n<li>8 and 9<br>These pairs work well! \ud83d\ude4c<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83e\udde9 <strong>Visual Tip<\/strong><\/h3>\n\n\n\n<p>If you see two numbers like <strong>N<\/strong> and <strong>N+1<\/strong>,<br>\ud83d\udccc Think: <em>(N+1) + (N+1) \u2212 1<\/em><br>This makes addition faster and more fun! \u2728<\/p>\n\n\n\n<p class=\"has-text-align-center has-text-color has-link-color has-large-font-size wp-elements-3fefd20f8ce119a518e5f53333ab5486\" style=\"color:#105000\"><strong>Learn with an example<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color wp-elements-a2b5f47d1c47317f2b8cd98e60ff3678\" style=\"background-color:#f0eca5\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color wp-elements-8930b0c95e8463332d53e61ebbfade01\" style=\"color:#b00012\">\ud83d\udd8c\ufe0f<strong>Add the near doubles.<\/strong><br>Hint: use the doubles fact 4+4=8.<br>4+3=<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To add 4+3, you can use the strategy of doubles minus one. This is because 4 and 3 are near doubles.<\/li>\n\n\n\n<li>Replace the 3 with 4\u20131 to make double 4s.<\/li>\n\n\n\n<li>4+3=4+4\u20131<\/li>\n\n\n\n<li>Add the double 4s. Use the doubles fact 4+4=8.<\/li>\n\n\n\n<li>4+4\u20131=8\u20131<\/li>\n\n\n\n<li>Subtract 1.<\/li>\n\n\n\n<li>8\u20131=7<\/li>\n\n\n\n<li>So, 4+3=7.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color wp-elements-ca2364517b85640076e4714f8b0edf6c\" style=\"background-color:#b2f2e4\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color wp-elements-2ca6560b37fb543e343ef06aab74792b\" style=\"color:#b00012\">\ud83d\udd8c\ufe0f<strong>Add the near doubles.<\/strong><br>Hint: use the doubles fact 6+6=12.<br>6+5=<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To add 6+5, you can use the strategy of doubles minus one. This is because 6 and 5 are near doubles.<\/li>\n\n\n\n<li>Replace the 5 with 6\u20131 to make double 6s.<\/li>\n\n\n\n<li>6+5=6+6\u20131<\/li>\n\n\n\n<li>Add the double 6s. Use the doubles fact 6+6=12.<\/li>\n\n\n\n<li>6+6\u20131=12\u20131<\/li>\n\n\n\n<li>Subtract 1.<\/li>\n\n\n\n<li>12\u20131=11<\/li>\n\n\n\n<li>So, 6+5=11.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color wp-elements-a4e0f4d2a1fa093902cd9f79a5a41e7e\" style=\"background-color:#bcd0fa\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-background-background-color has-text-color has-background has-link-color wp-elements-cd1ca34bfc7592fd41d06156904deb9c\" style=\"color:#b00012\">\ud83d\udd8c\ufe0f<strong>Add the near doubles.<\/strong><br>Hint: use the doubles fact 3+3=6.<br>3+2=<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To add 3+2, you can use the strategy of doubles minus one. This is because 3 and 2 are near doubles.<\/li>\n\n\n\n<li>Replace the 2 with 3\u20131 to make double 3s.<\/li>\n\n\n\n<li>3+2=3+3\u20131<\/li>\n\n\n\n<li>Add the double 3s. Use the doubles fact 3+3=6.<\/li>\n\n\n\n<li>3+3\u20131=6\u20131<\/li>\n\n\n\n<li>Subtract 1.<\/li>\n\n\n\n<li>6\u20131=5<\/li>\n\n\n\n<li>So, 3+2=5.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-de9e97447719430221d5ffbb0cb6d2aa\" style=\"color:#d90000\">Let&#8217;s practice!<\/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\/80169\/007\/915\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-2-214-32.png\" alt=\"\" class=\"wp-image-11767\" srcset=\"https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-2-214-32.png 500w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-2-214-32-300x300.png 300w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-2-214-32-150x150.png 150w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-2-214-32-400x400.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\/38502\/834\/408\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-1-1-217-32.png\" alt=\"\" class=\"wp-image-11768\" srcset=\"https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-1-1-217-32.png 500w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-1-1-217-32-300x300.png 300w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-1-1-217-32-150x150.png 150w, https:\/\/1stclass.deltapublications.in\/wp-content\/uploads\/2024\/06\/Worksheet-1-1-1-217-32-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Add using doubles minus one Key notes:- \ud83d\udd22 What are doubles? Doubles are when both numbers are the same. \u2796\u2795 What is \u201cdoubles minus one\u201d? When the numbers are next to each other (like 5 and 6), we use the bigger number\u2019s double and subtract one. Example: 5 + 6 is close to 6 +<a class=\"more-link\" href=\"https:\/\/1stclass.deltapublications.in\/index.php\/f-3-add-using-doubles-minus-one\/\">Continue reading <span class=\"screen-reader-text\">&#8220;F.3 Add using doubles minus one&#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":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-11041","page","type-page","status-publish","hentry","entry"],"_links":{"self":[{"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/11041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=11041"}],"version-history":[{"count":15,"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/11041\/revisions"}],"predecessor-version":[{"id":19948,"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/11041\/revisions\/19948"}],"wp:attachment":[{"href":"https:\/\/1stclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=11041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}