The **square root** of a number is best described by the question:

What number has been squared to get the number under the square root symbol?

The square root of 4, , is 2. That means that if 2 is squared, it will equal 4.

The key will find the square root of whatever is in the display on your calculator.

**Every number has a square and a square root. Here are some examples of square roots:**

The variables in the last three examples show another rule of math:

**The square root of a number squared is the number.**

For example: or = 2.

**Square root practice:** Find the square root for each of the following numbers.

Use the key. Round off to 4 decimal places.

(1) 1 (7) 74.525
(2) 11 (8) 35 7/8
(3) 54.5 (9) a^2
(4) 16 3/4 (10) b^2
(5) 400 (11) 144
(6) 127 (12) 100

**Answers.**