1. Estimating Square Roots
Notes and Skills Practice

2. Perfect Squares
Square roots that work out evenly are called “perfect squares”

3. What if it’s not a perfect square?
Square roots that do not work out evenly are irrational numbers
Because of this, we can only estimate or round the answer

4. Steps Find the two perfect squares that the number is between
Decide if the decimal should be big, small, or in the middle
Multiply until you find the decimal that is closest

5. Notes – Estimating Square Roots
Perfect Squares – Double check your table!

6. Example
79 ≈ 79
8.__
8.9
8.8
x 8.8
704
+7040
77.44
8.9
x 8.9
801
+7120
79.21

7. Practice – Estimating Square Roots
3.7
7.1
6.2
9.5
2.4
12.6
1) ) 90
2) ) 6
3) ) 160