Estimating Square Roots in Pre-Algebra

What is a perfect square?

• A number whose square root is a whole number

• A number that can be written as a fraction

• A number that has a repeating decimal

• A number that cannot be written as a fraction

Which of the following is an example of a non-perfect square?

• 81

• 64

• 6

• 4

The square root of 50 is closest to which two integers?

• 9 and 10

• 8 and 9

• 7 and 8

• 6 and 7

What is a good decimal estimate for the square root of 50?

• 7.1

• 8.1

• 7.5

• 7.9

The square root of 22 is closest to which two integers?

• 3 and 4

• 4 and 5

• 5 and 6

• 6 and 7

What is a good decimal estimate for the square root of 22?

• 4.1

• 4.7

• 4.3

• 4.9

Which of the following square roots is best represented by point A between 3 and 4?

• Square root of 8

• Square root of 20

• Square root of 10

• Square root of 15

The square root of 198 is closest to which two integers?

• 14 and 15

• 16 and 17

• 13 and 14

• 15 and 16

Between which two integers does the square root of 90 lie?

• 8 and 9

• 9 and 10

• 10 and 11

• 11 and 12

Rebecca bought a square table with an area of 65 square feet. What is the approximate length of one side?

• 8.1

• 8.5

• 7.5

• 7.1