Written by August 5, 2025
Abacus Math Program – Lesson 9 – Five Pair Complement Part 1
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We are now half way through the Rightlobemath.com skill training program. So far we have learned to represent base 10 numbers on the abacus, add and subtract with 10 pair complements when the operation involves more than 1 rod. If you are not familiar with these concepts please go back through the online abacus math program lessons starting with Lesson