West B Test Math: Number Sense and Operations 5 — Questions and Answers
Question 1: What is the value of √144?
- 11
- 12 (Correct answer)
- 13
- 14
Correct answer: 12
12 × 12 = 144, so √144 = 12.
Question 2: Which of the following represents 5/8 as a decimal?
- 0.58
- 0.625 (Correct answer)
- 0.65
- 0.580
Correct answer: 0.625
5 ÷ 8 = 0.625.
Question 3: If a number is increased by 40% and then decreased by 40%, what is the net result?
- No change
- A 16% decrease (Correct answer)
- A 16% increase
- A 4% decrease
Correct answer: A 16% decrease
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?
- 2⁴
- 3³ (Correct answer)
- 4²
- 5¹
Correct answer: 3³
2⁴=16, 3³=27, 4²=16, 5¹=5; therefore 3³=27 is the greatest.
Question 5: A number is divisible by 9 if:
- It ends in 9
- It is odd
- The sum of its digits is divisible by 9 (Correct answer)
- It is divisible by 3 but not 6
Correct answer: The sum of its digits is divisible by 9
The divisibility rule for 9 states that a number is divisible by 9 if the sum of its digits is divisible by 9.
Question 6: Which of the following is true about the number 0?
- 0 is a positive integer
- 0 is a negative integer
- 0 is neither positive nor negative (Correct answer)
- 0 is an irrational number
Correct answer: 0 is neither positive nor negative
Zero is an integer and a real number, but it is neither positive nor negative.
Question 7: What is the value of 7! (7 factorial)?
- 49
- 720
- 2520
- 5040 (Correct answer)
Correct answer: 5040
7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040.
