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Many mathematical operations have an inverse, or opposite, operation.
Subtraction is the opposite of addition, division is the inverse of multiplication, and so on. Remember, the square of a number is that number times itself. The square root of a number, n, written is the number that gives n when multiplied by itself. Here are the square roots of all the perfect squares from 1 to 100. Finding square roots of of numbers that aren't perfect squares without a calculator 1.