Here is the step by step abacus math solution for 10-PAIR-ADDITION-EXAMPLE-8 problem from rightlobemath.com. Rods are referenced left to right consecutively by letter labels ABCDE. Rod E is any selected unit rod (usually with a dot), i.e. the one's place, chosen on the abacus.
4 |
-1 |
7 |
2 |
12 |
Step 1: Add 4 to 0 on rod E.
Step 2: Subtract 1 from 4 on rod E.
Step 3: Add 7 to 3 by first adding 1 to 0 on rod D. Then subtract the 7, 10 pair 3, from 3 on rod E.
Step 4: Add 2 to 0 on rod E.
The final answer is 12
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