{"id":402,"date":"2025-08-19T10:00:00","date_gmt":"2025-08-19T10:00:00","guid":{"rendered":"https:\/\/www.rightlobemath.com\/blog\/?p=402"},"modified":"2025-08-19T10:00:00","modified_gmt":"2025-08-19T10:00:00","slug":"abacus-math-program-lesson-11-the-5-10-pair-combination-part-1","status":"publish","type":"post","link":"https:\/\/sumomath.com\/content\/abacus-math-program-lesson-11-the-5-10-pair-combination-part-1\/","title":{"rendered":"Abacus Math Program &#8211; Lesson 11 &#8211; The 5\/10 Pair Combination Part 1"},"content":{"rendered":"<p>So far in\u00a0<a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-5-ten-pair-complement-addition\/\"><u>Lesson 5<\/u><\/a>, <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-6-ten-pair-complement-addition-part-2\/\"><u>6<\/u><\/a>, <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-7-ten-pair-complement-subtraction-part-1\/\"><u>7<\/u><\/a>, and <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-8-ten-pair-complement-subtraction-part-2\/\"><u>8<\/u><\/a>\u00a0we introduced addition and subtraction with 10 pair complements when the operation requires more than 1 rod. In <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-9-five-pair-complement-part-1\/\"><u>Lesson 9<\/u><\/a> and <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-10-five-pair-complement-part-2\/\"><u>10<\/u><\/a> we introduced addition and subtraction with 5 pair complements when the operation is done on a single rod, i.e. no carry or borrow is required from another rod. Now here in Lesson 11 we will combine both the 5 and 10 pair complements in a single bead movement.\u00a0In Lesson 11 Part 1\u00a0we will look at examples that\u00a0need to perform a 10 pair complement\u00a0addition but instead of subtracting the 10 pair directly we subtract in the form of a 5 pair complement. In all these cases we will need to subtract a 10 pair less than 5 but there will not be a sufficient number of lower\u00a0earthly beads touching the bar to subtract the 10 pair complement directly. So we will need to use the upper\u00a0heavenly 5 bead to complete the movement.<\/p>\n<p style=\"margin: 0px 0px 10px;\">Let&#8217;s look at the example problem 7 + 7. To add the second 7 to the first we use the 10 pair addition rule. So first add 1 to the next rod left and then\u00a0subtract 3, the 10 pair complement\u00a0of 7, from 7 on the target rod.\u00a0However to subtract 3 from 7 we need to use the 5 pair subtraction rule since\u00a0we only have 2 lower earthly beads touching the reckoning bar. Therefore to subtract the 10 pair complement 3, in the form of a 5 pair we add 2 earthly beads, 3&#8217;s five pair complement, and subtract the 5 bead leaving the\u00a0answer of 14.<\/p>\n<p><strong data-redactor-tag=\"strong\" data-verified=\"redactor\">The possible\u00a05\/10 pair\u00a0addition combinations are:<br \/><\/strong><br \/>1. 5+6, 5+7, 5+8, 5+9<br \/>2. 6+6, 6+7, 6+8<br \/>3. 7+6, 7+7<br \/>4. 8+6<\/p>\n<p>In this first example we start by adding 17 to the abacus adding 1 to 0 on rod A and 7 to 0 on rod B. Next we add 6 to 17 by adding 6 to 7 on rod B. Notice this addition will require using the 5\/10 pair combination. First doing the 10 pair addition we add 1 to 1 on rod A and then subtract 4, the 10 pair complement of 6, from 7 on rod B. But since there are only 2 lower beads touching the bar we will need to subtract the 4 as a 5 pair. So subtract the 4 by adding 1, the 5 pair complement of 4, and subtract the 5 bead. The interim sum is now 23. Next add 2 to 23 by adding 2 to 3 on rod B using the 5 pair addition. Add 5 and subtract 2, the 5 pair complement of 3, on rod B for an interim sum of 25. Lastly subtract 8 from 25 by subtracting 8 from 5 on rod B using the 10 pair subtraction rule. First subtract 1 from 2 on rod A and then add 2, the 10 pair complement of 8, to 5 on rod B. The final answer is 17.<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"358\" src=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example1.png\" alt=\"\" srcset=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example1.png 472w, https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example1-300x228.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p>In this next example we start by adding 5 to the abacus on rod B. Next we add 9 to 5 on rod B using the 10 pair addition rule. First add 1 to 0 on rod A and then subtract 1, the 10 pair complement of 9, from 5 on rod B. To subtract 1 from 5, we will need to use a 5 pair subtraction. So add 4, the 5 pair complement 1, to rod B and then subtract 5 for an interim sum of 14. Next add 8 to 14 by adding 8 to 4 on rod B. Again we will use a 10 pair addition by adding 1 to 1 on rod A and then subtract 2, the 10 pair complement of 8, from 4 on rod B for an interim sum of 22. Finally we add 3 to 22 by adding 3 to 2 using a 5 pair addition. So add 5 and then subtract 2, the 5 pair complement of 3 on rod B. The final answer is 25.<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"359\" src=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example2.png\" alt=\"\" srcset=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example2.png 472w, https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example2-300x228.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p>In the last example we start by adding 15 to the abacus adding 1 to 0 on rod A and 5 to 0 on rod B. Next subtract 7 from 15 by using the 10 pair subtraction rule. First subtract 1 from 1 on rod A and then add 3, the 10 pair complement of 7, to 5 on rod B for an interim sum of 8. Next subtract 2 from 8 on rod B for an interim sum of 6. Lastly add 8 to 6 on rod B using the 10 pair addition rule. So first add 1 to 0 on rod A then subtract the 2, the 10 pair complement of 8, from 6 on rod B. To complete the subtraction we will need to use a 5 pair subtraction. So subtract 2 from 6 by adding 3, the 5 pair of 2, and then subtract\u00a05 for a final answer of 14.\u00a0<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"359\" src=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example3.png\" alt=\"\" srcset=\"https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example3.png 472w, https:\/\/www.sumomath.com\/content\/wp-content\/uploads\/2020\/02\/lesson9example3-300x228.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/p>\n<p>Next up <a href=\"https:\/\/www.sumomath.com\/content\/abacus-math-program-lesson-12-the-5-10-pair-combination-part-2\/\"><u>Lesson 12 the 5\/10 Pair Combination Part 2<\/u><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>So far in\u00a0Lesson 5, 6, 7, and 8\u00a0we introduced addition and subtraction with 10 pair complements when the operation requires more than 1 rod. In Lesson 9 and 10 we introduced addition and subtraction with 5 pair complements when the operation is done on a single rod, i.e. no carry or borrow is required from<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-402","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Abacus Math Program - Lesson 11 - The 5\/10 Pair Combination Part 1 - sumomath.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sumomath.com\/content\/abacus-math-program-lesson-11-the-5-10-pair-combination-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Abacus Math Program - Lesson 11 - The 5\/10 Pair Combination Part 1 - sumomath.com\" \/>\n<meta property=\"og:description\" content=\"So far in\u00a0Lesson 5, 6, 7, and 8\u00a0we introduced addition and subtraction with 10 pair complements when the operation requires more than 1 rod. 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