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Learn the Abacus -9 Formula using the technique -9 = -10 + 1 with the Abacus Trainer Digital Abacus Tool. This lesson introduces children to one of the important subtraction techniques based on complements of 10.
The formula helps students understand how to subtract 9 by subtracting 10 and adding 1. Learning this number combination improves their understanding of number relationships and helps them perform abacus calculations more confidently.
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