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Learn how to perform abacus subtraction using the -3 = -10 + 7 formula with the Abacus Trainer Digital Abacus Tool. This lesson introduces children to the complement-of-10 technique through simple explanations, visual bead movements and practical subtraction exercises.
When students need to subtract 3 and cannot move the required beads directly, they can use the ten's complement technique. By subtracting 10 and adding 7, students can understand how to complete the calculation using the abacus.
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