Square Roots and Rational/Irrational

True or False. 21 is a perfect square.

• True

• False

–√25

• 5
• -5
• ±5
• None

Which of the following is NOT a perfect square?

• 1
• 4
• 100
• 8

x² = 121

• 11,-11
• 11
• -11
• 10,-10

Solve x² = 16

• 4
• 4, -4
• 256

Solve x² = 289

• 17
• 17, -17
• 18
• 18, -18

Evaluate √72. Round your answer to the nearest Whole Number. 

• 7.2
• 7
• 8
• 9

What is 5 cubed?

5³

• 125

• 25

• 15

• 625

The number 512 is a perfect cube because 512 = 8³.

Which number below is also a perfect cube?

• 125

• 300

• 150

• 256

• >

• < 

• =