West B Test Math: Number Sense and Operations 5

Question 1

What is the value of √144?

Accepted Answer

12

Answer

12 × 12 = 144, so √144 = 12.

Question 2

Which of the following represents 5/8 as a decimal?

Accepted Answer

0.625

Answer

5 ÷ 8 = 0.625.

Question 3

If a number is increased by 40% and then decreased by 40%, what is the net result?

Accepted Answer

A 16% decrease

Answer

Increasing by 40% gives ×1.4, then decreasing by 40% gives ×0.6; 1.4 × 0.6 = 0.84, which is a 16% decrease.

Question 4

Which expression has the greatest value?

Accepted Answer

3³

Answer

2⁴=16, 3³=27, 4²=16, 5¹=5; therefore 3³=27 is the greatest.

Question 5

A number is divisible by 9 if:

Accepted Answer

The sum of its digits is divisible by 9

Answer

The divisibility rule for 9 states that a number is divisible by 9 if the sum of its digits is divisible by 9.

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