{"id":62,"date":"2022-04-12T04:40:47","date_gmt":"2022-04-12T04:40:47","guid":{"rendered":"http:\/\/4thclass.deltapublications.in\/?page_id=62"},"modified":"2025-08-30T10:25:59","modified_gmt":"2025-08-30T10:25:59","slug":"c-7-estimate-differences-word-problems","status":"publish","type":"page","link":"https:\/\/4thclass.deltapublications.in\/index.php\/c-7-estimate-differences-word-problems\/","title":{"rendered":"C.7 Estimate differences: word problems"},"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 differences: word problems<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/08\/C.7-Estimate-differences_-word-problems.mp4\"><\/video><\/figure>\n\n\n\n<p class=\"has-text-color has-link-color wp-elements-d7e05e27833e0b099449f6bbfc49e381\" style=\"color:#74008b\"><strong>Key notes :<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong><strong>\ud83d\udd11 Key Points to Remember<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Estimate<\/strong> means to find an <strong>approximate answer<\/strong>, not the exact one.<\/li>\n\n\n\n<li>To estimate, we usually <strong>round numbers<\/strong> to the nearest <strong>tens, hundreds, or thousands<\/strong> before subtracting.<\/li>\n\n\n\n<li>Estimation helps us <strong>check reasonableness<\/strong> of answers and solve quickly.<\/li>\n\n\n\n<li>Use words like <strong>about<\/strong>, <strong>nearly<\/strong>, <strong>close to<\/strong>, or <strong>approximately<\/strong> in estimated answers.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong><strong>\u2728 Steps to Estimate Differences<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Read the word problem carefully.<\/strong><\/li>\n\n\n\n<li><strong>Identify the numbers<\/strong> to be subtracted.<\/li>\n\n\n\n<li><strong>Round the numbers<\/strong> (to nearest 10, 100, or 1000 as needed).<\/li>\n\n\n\n<li><strong>Subtract the rounded numbers.<\/strong><\/li>\n\n\n\n<li><strong>Write the estimated answer.<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong><strong>\ud83d\udcdd Examples<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Example 1:<\/strong><br>A school has <strong>742 students<\/strong>. About <strong>389 students<\/strong> went on a trip. Estimate how many students stayed back.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Step 1: Round 742 \u2192 <strong>700<\/strong> (nearest hundred)<\/li>\n\n\n\n<li>Step 2: Round 389 \u2192 <strong>400<\/strong> (nearest hundred)<\/li>\n\n\n\n<li>Step 3: Subtract: 700 \u2013 400 = <strong>300<\/strong><br>\u2705 Estimated Answer: About <strong>300 students<\/strong> stayed back.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Example 2:<\/strong><br>A farmer harvested <strong>1,246 apples<\/strong> on Monday and sold <strong>873 apples<\/strong>. Estimate how many apples are left.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Step 1: Round 1,246 \u2192 <strong>1,200<\/strong><\/li>\n\n\n\n<li>Step 2: Round 873 \u2192 <strong>900<\/strong><\/li>\n\n\n\n<li>Step 3: Subtract: 1,200 \u2013 900 = <strong>300<\/strong><br>\u2705 Estimated Answer: About <strong>300 apples<\/strong> are left.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Example 3:<\/strong><br>A shop had <strong>3,178 pencils<\/strong>. It sold <strong>2,643 pencils<\/strong>. Estimate how many pencils remain.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Step 1: Round 3,178 \u2192 <strong>3,200<\/strong><\/li>\n\n\n\n<li>Step 2: Round 2,643 \u2192 <strong>2,600<\/strong><\/li>\n\n\n\n<li>Step 3: Subtract: 3,200 \u2013 2,600 = <strong>600<\/strong><br>\u2705 Estimated Answer: About <strong>600 pencils<\/strong> remain.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong>\ud83d\udca1 <strong>Tips<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the question asks for a <strong>quick guess<\/strong>, always <strong>estimate<\/strong> instead of solving exactly.<\/li>\n\n\n\n<li>Use estimation to check if your <strong>exact subtraction<\/strong> is reasonable.<\/li>\n\n\n\n<li>Sometimes rounding to <strong>nearest tens<\/strong> gives better accuracy, other times to <strong>nearest hundreds<\/strong> is enough.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong><strong>\ud83c\udfaf Practice Word Problems<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A factory produced <strong>4,892 toys<\/strong> in January and sold <strong>3,467 toys<\/strong>. Estimate how many toys are left.<\/li>\n\n\n\n<li>There were <strong>2,135 books<\/strong> in the library. About <strong>1,879 books<\/strong> were borrowed. Estimate how many books are still in the library.<\/li>\n\n\n\n<li>A bus can carry <strong>965 people<\/strong> in a week, but only <strong>478 people<\/strong> traveled last week. Estimate how many seats were empty.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-text-color has-link-color has-fixed-layout\" style=\"color:#000060\"><tbody><tr><td><strong><strong>\ud83d\udccc Conclusion:<\/strong><\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p> <br>Estimation is a quick way to solve subtraction problems in real life. It gives an answer that is <strong>close to the actual difference<\/strong> and helps us save time.<\/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-primary-color has-text-color has-background has-link-color has-normal-font-size wp-elements-31666ceaf8b197f65260e6f67334663c\" style=\"background-color:#b7c5eb\"><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-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color\" style=\"color:#b00012\">\ud83c\udfaf Kelsey just started working at a French restaurant. Last week, she polished a  combined total of 981 small and large glasses. If Kelsey polished 292 small glasses, about how many large glasses did she polish? Choose the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<p>Subtract the number of small glasses polished from the total number of glasses.<\/p>\n\n\n\n<p class=\"has-text-align-center\">981 \u2212 292 = ?<\/p>\n\n\n\n<p>Round each number to the nearest hundred.<\/p>\n\n\n\n<p class=\"has-text-align-center\">981 \u2013 292 = ?<br>1,000 \u2013 300 = 700<\/p>\n\n\n\n<p>700 is the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color has-normal-font-size wp-elements-9f5f5a9a377d72521cf3d562a357eba1\" style=\"background-color:#f4ccf7\"><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-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-left has-text-color\" style=\"color:#d90000\">\ud83c\udfaf Last year a total of 864 passengers landed at Somerville&#8217;s airport. However, only 589 had on-time arrivals. About how many passengers did not have on-time arrivals at Somerville&#8217;s airport last year? Choose the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<p>Subtract the number of passengers who had on-time arrivals from the total number of passengers.<\/p>\n\n\n\n<p class=\"has-text-align-center\">864 \u2212 589 = ?<\/p>\n\n\n\n<p>Round each number to the nearest hundred.<\/p>\n\n\n\n<p class=\"has-text-align-center\">864 \u2013 589 = ?<br>900 \u2013 600 = 300<\/p>\n\n\n\n<p>300 is the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color has-normal-font-size wp-elements-30a94773edb8d7f17f5e878703748c7e\" style=\"background-color:#fbfcc2\"><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-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-left has-text-color\" style=\"color:#d90000\">\ud83c\udfaf A crayon company recently changed its labels. It currently has 991 crayons in stock, 886 of which have the new label. How many crayons with the old label does the company have in stock? Choose the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<p>Subtract the number of crayons with the new label from the total number of crayons.<\/p>\n\n\n\n<p class=\"has-text-align-center\">991 \u2212 886 = ?<\/p>\n\n\n\n<p>Round each number to the nearest hundred.<\/p>\n\n\n\n<p class=\"has-text-align-center\">991 \u2013 886 = ?<br>1,000 \u2013 900 = 100<\/p>\n\n\n\n<p>100 is the better estimate.<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\"><strong>Let&#8217;s practice!<\/strong><\/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\/76332\/226\/964\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-116.png\" alt=\"\" class=\"wp-image-6581\" srcset=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-116.png 500w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-116-300x300.png 300w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-116-150x150.png 150w\" 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\/76331\/815\/664\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-110.png\" alt=\"\" class=\"wp-image-6582\" srcset=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-110.png 500w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-110-300x300.png 300w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-110-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Estimate differences: word problems Key notes : \ud83d\udd11 Key Points to Remember \u2728 Steps to Estimate Differences \ud83d\udcdd Examples Example 1:A school has 742 students. About 389 students went on a trip. Estimate how many students stayed back. Example 2:A farmer harvested 1,246 apples on Monday and sold 873 apples. Estimate how many apples are<a class=\"more-link\" href=\"https:\/\/4thclass.deltapublications.in\/index.php\/c-7-estimate-differences-word-problems\/\">Continue reading <span class=\"screen-reader-text\">&#8220;C.7 Estimate differences: word problems&#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":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-62","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/62","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=62"}],"version-history":[{"count":21,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/62\/revisions"}],"predecessor-version":[{"id":15865,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/62\/revisions\/15865"}],"wp:attachment":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}