Perfect Squares and Square Roots

Perfect Squares and Square Roots

Perfect Squares

• Numbers that result from multiplying a whole number by itself.

• 16 is a PERFECT SQUARE because 4² = 16

• 121 is a PERFECT SQUARE because 11² = 121

Practice!

On the following slides, find the perfect squares.

Multiple Choice

Find 5²

• 15

• 25

• 20

• 10

Multiple Choice

Find 10²

• 100

• 20

• 200

• 10

Multiple Choice

Find 9²

• 18

• 81

• 90

• 64

Multiple Choice

Find 8²

• 68

• 64

• 16

• 56

Square Roots

• Taking the square root means finding what number multiplied by itself to get the number under the radical (square root symbol).

• This is a radical:  $\sqrt{\ \ \ \ }$  

•  $\sqrt{25}=5$  because  $5^2=25$ 

•  $\sqrt{100}=\ ?$  

Practice!

On the following slides, find the square roots.

Multiple Choice

 $\sqrt{49}$  

• 7

• 3

• 4

• 6

Multiple Choice

 $\sqrt{400}$  

• 20

• 100

• 4

• 200

Multiple Choice

 $\sqrt{36}$  

• 3

• 6

• 7

• 18

Multiple Choice

 $\sqrt{144}$  

• 12

• 100

• 11

• 13

Poll

How do you feel about finding perfect squares and square roots?