Written by September 23, 2025
Abacus Math Program – Lesson 16 – Reverse Double Rod
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In Lesson 11 we looked at the Forward Double Rod movement for addition problems. Now let’s take a look at the Reverse Double Rod movement for subtraction. The double rod movement for subtraction is exactly the same as for addition with the only difference using the 10 pair subtraction rule instead. Again we will repeatedly use the