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In this lesson, understand how to handle –1 subtraction on the abacus using the Big Friends formula (–10 + 9). Instead of subtracting 1 directly, this smart technique makes calculations smoother and faster.
Using a digital abacus tool, this video shows how to:
✔ Subtract 10 easily
✔ Add back 9 correctly
✔ Solve subtraction problems without confusion
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