1. Square Roots
Teacher Twins©2014

2. Warm Up
Evaluate.
2(9 – 7)
-14 – 9( )
12(-2) + -15/-3
4 + 9(-4) + -15

3. Warm Up Answers
1. -2
2. -50

4. Square Roots

5. Square Roots
The opposite of squaring a number is finding a square root.
A square root of a number is one of its two equal factors.
Since 4 x 4 = 16, a square root of 16 is 4.

6. Square Roots
Numbers such as 1, 4, 9, 16, and 25 are called perfect squares because they are squares of whole numbers.

13. Closure
Explain how you can find the length of a side of a square if you know the area of the square is 64 ft2.