what are big friend formula and small friend formula in abacus?
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Small friends are numbers that add up to a total of 5. Big Friends are numbers that add up to a total of 10. There is a method to the madness on applying “friends”, but before diving into that, familiarity with Abacus Basics is mandatory. If you want to learn abacus basics, feel free to review this playlist on youtube.
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Small friend formula of abacus
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