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In this video, you will learn the -1 formula in abacus, also known as the +4 - 5 formula, a key technique used for quick and efficient subtraction. This method is especially useful when direct subtraction is not possible, helping children solve problems in a smarter way.
The minus one formula in abacus is part of the small friends subtraction method, which simplifies calculations by breaking numbers into easy steps. This makes it easier for kids to understand and apply the concept accurately.
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