A Far Nicer Arithmetic
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Suppose you have to do an addition, say 357 + 586. How much do you need to know in order to know the last digit of the answer? Would the last digit of each summand be enough? Suppose, instead, that it’s a subtraction problem? A multiplication problem? A division problem?
KeywordsResidue Class Quadratic Residue Division Problem Subtraction Problem Special Modulus
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