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Learn how to solve +7 problems in abacus using the Big Friends formula (+10 − 3) in a simple and easy way. This video by Abacus Trainer explains step-by-step how to use the digital abacus tool to perform faster calculations with better accuracy.
The +7 Big Friends trick helps children understand how to add numbers efficiently by converting +7 into +10 and subtracting 3. This method improves mental math skills, concentration, and calculation speed.
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