Written by August 19, 2025
Abacus Math Program – Lesson 11 – The 5/10 Pair Combination Part 1
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So far in Lesson 5, 6, 7, and 8 we 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