{"id":8418,"date":"2012-04-21T07:00:44","date_gmt":"2012-04-21T07:00:44","guid":{"rendered":"http:\/\/profpete.com\/blog\/?p=8418"},"modified":"2018-12-15T10:46:10","modified_gmt":"2018-12-15T10:46:10","slug":"teach-the-9x-nine-times-tables","status":"publish","type":"post","link":"https:\/\/profpete.com\/blog\/2012\/04\/21\/teach-the-9x-nine-times-tables\/","title":{"rendered":"Teach the 9x Nine Times Tables"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n\n<p>This podcast video is from my Free Math Worksheets series, which you can access\u00a0here.<\/p>\n\n\n\n<p>If the video does not display,\u00a0<a href=\"http:\/\/youtu.be\/eQpx_w9jsxk\">watch on YouTube<\/a>.<\/p>\n\n\n\n<p><strong>Download Free Worksheets:\u00a0<a href=\"http:\/\/s3.amazonaws.com\/FreeMathWkshts\/FreeMathWorksheet_06_9_Times_Facts.pdf\">9x Tables<\/a><\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"379\" height=\"490\" src=\"http:\/\/profpete.com\/blog\/wp-content\/uploads\/2018\/12\/April-21st-2012.jpg\" alt=\"\" class=\"wp-image-8421\" srcset=\"https:\/\/profpete.com\/blog\/wp-content\/uploads\/2018\/12\/April-21st-2012.jpg 379w, https:\/\/profpete.com\/blog\/wp-content\/uploads\/2018\/12\/April-21st-2012-232x300.jpg 232w\" sizes=\"(max-width: 379px) 100vw, 379px\" \/><\/figure>\n\n\n\n<p>Multiplying by 9 raises some really simple and interesting patterns, which you can use to help children to learn this set of number facts or times tables.<\/p>\n\n\n\n<p><strong>Teaching the 9x Nine Times Tables<\/strong><\/p>\n\n\n\n<p><strong>9x Tables: Start With 10<\/strong><\/p>\n\n\n\n<p>As explained in the video, if you start with the equivalent multiple of 10, you can then compensate to quickly find the 9x answer. For example, think about 8\u00d79:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>8 x 9 = ?<\/li><li>8 x 10 = 80<\/li><li>Subtract 8 ones (one for each set of 10): 80 \u2013 8 = 72<\/li><li>8 x 9 = 72<\/li><\/ul>\n\n\n\n<p><strong>9x Tables: Sum of Digits Equals 9<\/strong><\/p>\n\n\n\n<p>Look at the multiples of 9 up to 90, and check out the sum of the tens digit and the ones digit in each multiple:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>09&nbsp; :&nbsp; 0 + 9 = 9<\/li><li>18&nbsp; :&nbsp; 1 + 8 = 9<\/li><li>27&nbsp; :&nbsp; 2 + 7 = 9<\/li><li>36&nbsp; :&nbsp; 3 + 6 = 9<\/li><li>45&nbsp; :&nbsp; 4 + 5 = 9<\/li><li>54&nbsp; :&nbsp; 5 + 4 = 9<\/li><li>63&nbsp; :&nbsp; 6 + 3 = 9<\/li><li>72&nbsp; :&nbsp; 7 + 2 = 9<\/li><li>81&nbsp; :&nbsp; 8 + 1 = 9<\/li><li>90&nbsp; :&nbsp; 9 + 0 = 9<\/li><\/ul>\n\n\n\n<p>Students can use a two-step process which takes advantage of the above pattern:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>6 x 9 = ?<\/li><li>There must be 5 tens (because we know it is a bit less than 60)<\/li><li>So, 6 x 9 = 5?<\/li><li>If the digits in the answer add up to 9, what is the other digit; ie, 5 + ? = 9. The other digit must be \u20184\u2019<\/li><li>6 x 9 = 54<\/li><\/ul>\n\n\n\n<p><strong>9x Tables: Finger Trick<\/strong><\/p>\n\n\n\n<p>Put both hands up in front of you, palms facing away. Imagine that each finger is numbered, from left to right, from 1 to 10.<\/p>\n\n\n\n<p>To find a multiple of 9:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>3 x 9 = ?<\/li><li>Hold up your hands, thumbs together<\/li><li>Put down the finger that corresponds to the number multiplying the 9: the third finger<\/li><li>Count the fingers to the left of the finger that is down: 2 \u2013 this is the number of tens<\/li><li>Count the fingers to the right of the finger that is down: 7 \u2013 this is the number of ones<\/li><li>3 x 9 = 27<\/li><\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This podcast video is from my Free Math Worksheets series, which you can access\u00a0here. If the video does not display,\u00a0watch on YouTube. Download Free Worksheets:\u00a09x Tables Multiplying by 9 raises some really simple and interesting patterns, which you can use to help children to learn this set of number facts or times tables. Teaching the &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/profpete.com\/blog\/2012\/04\/21\/teach-the-9x-nine-times-tables\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Teach the 9x Nine Times Tables&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[79,11],"class_list":["post-8418","post","type-post","status-publish","format-standard","hentry","category-teaching-mathematics","tag-podcast","tag-teaching-math"],"_links":{"self":[{"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/posts\/8418"}],"collection":[{"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/comments?post=8418"}],"version-history":[{"count":2,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/posts\/8418\/revisions"}],"predecessor-version":[{"id":8422,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/posts\/8418\/revisions\/8422"}],"wp:attachment":[{"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/media?parent=8418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/categories?post=8418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/profpete.com\/blog\/wp-json\/wp\/v2\/tags?post=8418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}