{"id":217,"date":"2022-04-11T05:19:26","date_gmt":"2022-04-11T05:19:26","guid":{"rendered":"http:\/\/2ndclass.deltapublications.in\/?page_id=217"},"modified":"2025-03-24T09:14:43","modified_gmt":"2025-03-24T09:14:43","slug":"k-3-estimate-sums","status":"publish","type":"page","link":"https:\/\/2ndclass.deltapublications.in\/index.php\/k-3-estimate-sums\/","title":{"rendered":"K.3 Estimate sums"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-huge-font-size\" style=\"color:#00056d;text-transform:uppercase\"><strong> Estimate sums<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-ac2bc047fac346cd34a46d2a76287634\" style=\"color:#74008b;text-transform:capitalize\">key notes:<\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-648a51f64c86504b3b6af0d1b15c6e31\" style=\"color:#000060\"><strong>Understanding Estimation<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Estimation means finding a number close to the exact sum.<\/li>\n\n\n\n<li>It helps in quick calculations and checking answers.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-3ab51d173f29c494ac9c7df0fe73d961\" style=\"color:#000060\"><strong>Rounding Numbers<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Round numbers to the nearest <strong>10<\/strong> to make adding easier.<\/li>\n\n\n\n<li>Example: 47 rounds to 50, 32 rounds to 30.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-2fa5745dc1f05642a699dc715fa40002\" style=\"color:#000060\"><strong>Using Benchmark Numbers<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Identify numbers close to <strong>10, 20, 50, or 100<\/strong> to estimate sums quickly.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-591e3d01cbbe53c0b3579432b9bfedce\" style=\"color:#000060\"><strong>Mental Math Strategies<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Use <strong>friendly numbers<\/strong> (like 10, 20, 50) to estimate sums.<\/li>\n\n\n\n<li>Example: Estimate 48 + 23 \u2192 round to 50 + 20 = <strong>70<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-4305399d477ee1ec19ca09c63a764e85\" style=\"color:#000060\"><strong>Estimating with Two-Digit Numbers<\/strong><\/p>\n\n\n\n<p class=\"has-large-font-size\">Look at the <strong>tens place<\/strong> to decide how to round.<\/p>\n\n\n\n<p class=\"has-large-font-size\">Example: 56 + 38<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Round to 60 + 40 = <strong>100<\/strong> (estimated sum).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-025f0a8eed56c234d6b80a743b69888a\" style=\"color:#000060\"><strong>Checking Reasonableness<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Compare estimated sum with actual sum to see if it makes sense.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-c558b85bcda0b059487f7409f535b7f4\" style=\"color:#000060\"><strong>Importance of Estimation<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-large-font-size\">Helps in real-life situations like shopping, time management, and planning.<\/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\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#e6fcdc\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color has-link-color wp-elements-1be7d043180dff49af4cc0692c5e3977\" style=\"color:#b00012\">\u2708\ufe0f Estimate the sum by rounding each number to the nearest ten and then adding. 51 + 31<\/p>\n\n\n\n<p>The sum is approximately ___________.<\/p>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Round each number to the nearest ten.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"193\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/k-removebg-preview.png\" alt=\"\" class=\"wp-image-4082\"\/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>Now add: 50 + 30 = 80<\/li>\n\n\n\n<li>The sum is about 80.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#e2c7f6\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color has-link-color wp-elements-2020b2e6945eb6936e8ab145904c6df7\" style=\"color:#b00012\">\u2708\ufe0f Which addition problem has a sum of about 70?<br><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>11 + 41 <\/li>\n\n\n\n<li>28 + 41 <\/li>\n\n\n\n<li>11 + 13 <\/li>\n\n\n\n<li>62 + 19<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Estimate each sum by rounding each number to the nearest ten, then adding.<\/li>\n\n\n\n<li>This problem has a sum of about 50.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"406\" height=\"215\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design-removebg-preview-3.png\" alt=\"\" class=\"wp-image-4087\" style=\"width:361px;height:auto\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design-removebg-preview-3.png 406w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design-removebg-preview-3-300x159.png 300w\" sizes=\"auto, (max-width: 406px) 100vw, 406px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>This problem has a sum of about 70.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"394\" height=\"219\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__1_-removebg-preview-4.png\" alt=\"\" class=\"wp-image-4089\" style=\"width:349px;height:auto\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__1_-removebg-preview-4.png 394w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__1_-removebg-preview-4-300x167.png 300w\" sizes=\"auto, (max-width: 394px) 100vw, 394px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>This problem has a sum of about 20.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"411\" height=\"250\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__2_-removebg-preview.png\" alt=\"\" class=\"wp-image-4090\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__2_-removebg-preview.png 411w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__2_-removebg-preview-300x182.png 300w\" sizes=\"auto, (max-width: 411px) 100vw, 411px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>This problem has a sum of about 80.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"407\" height=\"250\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__3_-removebg-preview.png\" alt=\"\" class=\"wp-image-4091\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__3_-removebg-preview.png 407w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__3_-removebg-preview-300x184.png 300w\" sizes=\"auto, (max-width: 407px) 100vw, 407px\" \/><\/figure><\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-background has-large-font-size\" style=\"background-color:#d4f7ca\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group has-background-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-color has-link-color wp-elements-0393f9dff9adead76d54e6f4a9fff061\" style=\"color:#b00012\">\u2708\ufe0f Estimate the sum by rounding each number to the nearest ten and then adding.<\/p>\n\n\n\n<p>43 + 37<\/p>\n\n\n\n<p>The sum is approximately ________.<\/p>\n<\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Round each number to the nearest ten.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"363\" height=\"250\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__4_-removebg-preview.png\" alt=\"\" class=\"wp-image-4092\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__4_-removebg-preview.png 363w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2022\/12\/Untitled_design__4_-removebg-preview-300x207.png 300w\" sizes=\"auto, (max-width: 363px) 100vw, 363px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>Now add: 40 + 40 = 80<\/li>\n\n\n\n<li>The sum is about 80.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-large-font-size\" 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\/85889\/152\/915\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-256.png\" alt=\"\" class=\"wp-image-7512\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-256.png 500w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-256-300x300.png 300w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-256-150x150.png 150w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-256-400x400.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\/85888\/124\/531\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-250.png\" alt=\"\" class=\"wp-image-7513\" srcset=\"https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-250.png 500w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-250-300x300.png 300w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-250-150x150.png 150w, https:\/\/2ndclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-250-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Estimate sums key notes: Understanding Estimation Rounding Numbers Using Benchmark Numbers Mental Math Strategies Estimating with Two-Digit Numbers Look at the tens place to decide how to round. Example: 56 + 38 Checking Reasonableness Importance of Estimation Learn with an example \u2708\ufe0f Estimate the sum by rounding each number to the nearest ten and then<a class=\"more-link\" href=\"https:\/\/2ndclass.deltapublications.in\/index.php\/k-3-estimate-sums\/\">Continue reading <span class=\"screen-reader-text\">&#8220;K.3 Estimate sums&#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-217","page","type-page","status-publish","hentry","entry"],"_links":{"self":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/217","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=217"}],"version-history":[{"count":13,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/217\/revisions"}],"predecessor-version":[{"id":20870,"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/217\/revisions\/20870"}],"wp:attachment":[{"href":"https:\/\/2ndclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}