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Finding the square root of a number is the inverse operation of squaring that number. Remember, the square of a number is that number times itself.

The perfect squares are the squares of the whole numbers.

The square root of a number, n, written below is the number that gives n when multiplied by itself.

Many mathematical operations have an inverse, or opposite, operation. Subtraction is the opposite of addition, division is the inverse of multiplication, and so on. Squaring, which we learned about in a previous lesson (exponents), has an inverse too, called "finding the square root." Remember, the square of a number is that number times itself. The perfect squares are the squares of the whole numbers: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100 …

The square root of a number, n, written

Here are the square roots of all the perfect squares from 1 to 100