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Abacus Questions on +1 = +10 − 9 Formula | Big Friends Practice

In this video, we solve questions based on the Big Friends formula: +1 = +10 − 9 in abacus. This formula is very useful when direct addition is not possible, helping students perform calculations quickly and accurately.

Through this session, learners will practice multiple questions and understand how to apply the formula step by step in real calculations.

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