Abacus -7 = -10 + 3 Formula | Digital Abacus Subtraction Learning | Abacus Trainer

Learn how to subtract 7 using the Abacus -7 = -10 + 3 Formula. This lesson helps students understand the complement-of-10 technique and apply it to abacus subtraction calculations.

The formula explains how subtracting 7 can be represented by subtracting 10 and adding 3. By learning this number relationship, children can understand how to complete subtraction calculations using abacus bead movements.

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