{"id":158,"date":"2022-04-12T05:01:39","date_gmt":"2022-04-12T05:01:39","guid":{"rendered":"http:\/\/4thclass.deltapublications.in\/?page_id=158"},"modified":"2025-11-21T03:37:38","modified_gmt":"2025-11-21T03:37:38","slug":"f-8-mentally-add-and-subtract-numbers-ending-in-zeroes","status":"publish","type":"page","link":"https:\/\/4thclass.deltapublications.in\/index.php\/f-8-mentally-add-and-subtract-numbers-ending-in-zeroes\/","title":{"rendered":"F.8 Mentally add and subtract numbers ending in zeroes"},"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> Mentally add and subtract numbers ending in zeroes<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-bbf79a7dedb8bfae57277a5a477813ba\" style=\"color:#74008b\"><strong>Key notes : <\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udd22 <strong>Numbers ending in zeroes are multiples of 10, 100, or 1000<\/strong><\/h3>\n\n\n\n<p>Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>20, 40, 70 (tens)<\/li>\n\n\n\n<li>100, 300, 900 (hundreds)<\/li>\n\n\n\n<li>1000, 2000 (thousands)<\/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>Remove the zeroes to make the numbers easier<\/strong><\/h3>\n\n\n\n<p>To add or subtract quickly, ignore the zeroes first.<br>Example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>30 + 40 \u2192 think <strong>3 + 4 = 7<\/strong>, then add back the zero \u2192 <strong>70<\/strong><\/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\">\u2795 <strong>Adding numbers ending in zeroes<\/strong><\/h3>\n\n\n\n<p>Steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Drop the zeroes<\/li>\n\n\n\n<li>Add the basic numbers<\/li>\n\n\n\n<li>Put back the zeroes<\/li>\n<\/ol>\n\n\n\n<p>Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>50 + 70 \u2192 5 + 7 = 12 \u2192 add zero \u2192 <strong>120<\/strong><\/li>\n\n\n\n<li>200 + 300 \u2192 2 + 3 = 5 \u2192 add two zeroes \u2192 <strong>500<\/strong><\/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 <strong>Subtracting numbers ending in zeroes<\/strong><\/h3>\n\n\n\n<p>Steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Ignore the zeroes<\/li>\n\n\n\n<li>Subtract the small numbers<\/li>\n\n\n\n<li>Put the zeroes back<\/li>\n<\/ol>\n\n\n\n<p>Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>90 \u2212 40 \u2192 9 \u2212 4 = 5 \u2192 add zero \u2192 <strong>50<\/strong><\/li>\n\n\n\n<li>600 \u2212 200 \u2192 6 \u2212 2 = 4 \u2192 add two zeroes \u2192 <strong>400<\/strong><\/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\">\ud83c\udfaf <strong>Use place value (tens, hundreds) to think quickly<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>30 means <strong>3 tens<\/strong><\/li>\n\n\n\n<li>400 means <strong>4 hundreds<\/strong><\/li>\n<\/ul>\n\n\n\n<p>So,<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3 tens + 5 tens = <strong>8 tens \u2192 80<\/strong><\/li>\n\n\n\n<li>7 hundreds \u2212 2 hundreds = <strong>5 hundreds \u2192 500<\/strong><\/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\">\u26a1 <strong>Mental math tip<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Think in <strong>tens<\/strong>: 60 + 30 = 6 tens + 3 tens = <strong>9 tens = 90<\/strong><\/li>\n\n\n\n<li>Think in <strong>hundreds<\/strong>: 800 \u2212 300 = 8 hundreds \u2212 3 hundreds = <strong>500<\/strong><\/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\">\ud83c\udf08 <strong>Real-life connection<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u20b950 + \u20b920 = \u20b970<\/li>\n\n\n\n<li>300 ml \u2212 100 ml = 200 ml<\/li>\n\n\n\n<li>40 minutes + 20 minutes = 60 minutes (1 hour)<\/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>Practice makes you faster!<\/strong><\/h3>\n\n\n\n<p>Try quick examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>70 + 80 = ?<\/li>\n\n\n\n<li>900 \u2212 200 = ?<\/li>\n\n\n\n<li>40 + 30 = ?<\/li>\n\n\n\n<li>600 + 300 = ?<\/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-primary-color has-text-color has-background has-link-color has-large-font-size wp-elements-29743a6155e81093df92885dc1a67ded\" style=\"background-color:#f4d6e5\"><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-8f2b63eb01eb96f3d736e1abc8965aec\" style=\"color:#b00012\">\u2708\ufe0f <strong>Add: 2,000 + 4,000 =_____<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Notice that both numbers have 3 zeroes at the end. When the number of zeroes is the same, it is easy to add. First, arrange the numbers one above the other:<\/li>\n\n\n\n<li>2000+4000=_____<\/li>\n\n\n\n<li>Next, add the zeroes. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero plus zero equals zero.<\/li>\n\n\n\n<li>2000+4000= <strong>000<\/strong><\/li>\n\n\n\n<li>Now add the remaining digits. Two plus four is six.<\/li>\n\n\n\n<li>2000+4000= <strong>6<\/strong>,000<\/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 has-large-font-size wp-elements-1c0c261e1366296af3862e088a8bd54c\" style=\"background-color:#e7fdd7\"><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-56e7653b8f4594bcaa9b34a94445b751\" style=\"color:#b00012\">\u2708\ufe0f <strong>Add: 7,000 + 1,000 =______<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Notice that both numbers have 3 zeroes at the end. When the number of zeroes is the same, it is easy to add. First, arrange the numbers one above the other:<\/li>\n\n\n\n<li>7000+1000=____<\/li>\n\n\n\n<li>Next, add the zeroes. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero plus zero equals zero.<br>7000+1000=<strong>000<\/strong><\/li>\n\n\n\n<li>Now add the remaining digits. Seven plus one is eight.<\/li>\n\n\n\n<li>7000+1000=<strong>8<\/strong>,000<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group has-primary-color has-text-color has-background has-link-color has-large-font-size wp-elements-bcda900995c0cc0eb72d6f74ba01374c\" style=\"background-color:#d0eef1\"><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-9d81b34d6ca389fe03041bead5aa041c\" style=\"color:#b00012\">\u2708\ufe0f <strong>Subtract: 90,000 &#8211; 10,000 =____________<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Notice that both numbers have 4 zeroes at the end. When the number of zeroes is the same, it is easy to subtract. First, arrange the numbers one above the other:<\/li>\n\n\n\n<li>90000-10000=_______<\/li>\n\n\n\n<li>Next, subtract the zeroes. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero minus zero equals zero.<\/li>\n\n\n\n<li>90,000-10,000=<strong>0,000<\/strong><\/li>\n\n\n\n<li>Now subtract the remaining digits. Nine minus one is eight.<\/li>\n\n\n\n<li>90,000-10,000=<strong>80<\/strong>,000<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\"><strong>Let&#8217;s practice!\ud83d\udd8a\ufe0f<\/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\/80171\/935\/795\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-240.png\" alt=\"\" class=\"wp-image-7033\" srcset=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-240.png 500w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-240-300x300.png 300w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-3-240-150x150.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\/80477\/250\/978\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-236.png\" alt=\"\" class=\"wp-image-7034\" srcset=\"https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-236.png 500w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-236-300x300.png 300w, https:\/\/4thclass.deltapublications.in\/wp-content\/uploads\/2023\/04\/Worksheet-1-1-2-236-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Mentally add and subtract numbers ending in zeroes Key notes : \ud83d\udd22 Numbers ending in zeroes are multiples of 10, 100, or 1000 Examples: \ud83e\udde0 Remove the zeroes to make the numbers easier To add or subtract quickly, ignore the zeroes first.Example: \u2795 Adding numbers ending in zeroes Steps: Examples: \u2796 Subtracting numbers ending in<a class=\"more-link\" href=\"https:\/\/4thclass.deltapublications.in\/index.php\/f-8-mentally-add-and-subtract-numbers-ending-in-zeroes\/\">Continue reading <span class=\"screen-reader-text\">&#8220;F.8 Mentally add and subtract numbers ending in zeroes&#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-158","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/158","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=158"}],"version-history":[{"count":18,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/158\/revisions"}],"predecessor-version":[{"id":16794,"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/158\/revisions\/16794"}],"wp:attachment":[{"href":"https:\/\/4thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}