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→Ancient Indian algorithm for multiplying numbers close to a round number: Because who cares if it's Indian or ancient |
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Suppose we want to multiply two numbers <math>x</math> and <math>y</math> that are close to a round number <math>N</math>. Writing <math>x = N + x'</math> and <math>y=N+y'</math>, allows one to express the product as:
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