CBEST Math 4 — Questions and Answers
Question 1: A number is increased by 40% to get 84. What was the original number?
- 50
- 56
- 60 (Correct answer)
- 64
Correct answer: 60
Let the original number be n; 1.4n = 84, so n = 84 ÷ 1.4 = 60.
Question 2: What is the perimeter of a square with a side length of 9 meters?
- 27 m
- 36 m (Correct answer)
- 45 m
- 81 m
Correct answer: 36 m
Perimeter of a square = 4 × side = 4 × 9 = 36 m.
Question 3: Order from least to greatest: 0.45, 2/5, 47%, 0.4
- 0.4, 2/5, 0.45, 47% (Correct answer)
- 2/5, 0.4, 0.45, 47%
- 0.4, 2/5, 47%, 0.45
- 2/5, 0.4, 47%, 0.45
Correct answer: 0.4, 2/5, 0.45, 47%
Converting all to decimals: 0.4, 0.4, 0.45, 0.47; so the order is 0.4 = 2/5 < 0.45 < 47%.
Question 4: A train travels 180 miles in 2.5 hours. What is the train's average speed in miles per hour?
- 60 mph
- 68 mph
- 72 mph (Correct answer)
- 78 mph
Correct answer: 72 mph
Speed = distance ÷ time = 180 ÷ 2.5 = 72 mph.
Question 5: If a shirt originally costs $45 and is on sale for 20% off, what is the sale price?
- $34
- $36 (Correct answer)
- $38
- $40
Correct answer: $36
20% of $45 = $9; $45 − $9 = $36.
Question 6: The mean of five numbers is 14. Four of the numbers are 10, 12, 16, and 18. What is the fifth number?
- 12
- 13
- 14 (Correct answer)
- 15
Correct answer: 14
Total sum = 14 × 5 = 70; 70 − (10 + 12 + 16 + 18) = 70 − 56 = 14.
Question 7: Which expression is equivalent to 5(2x + 3)?
- 7x + 8
- 10x + 3
- 10x + 15 (Correct answer)
- 10x + 8
Correct answer: 10x + 15
Distribute 5: 5 × 2x = 10x and 5 × 3 = 15, giving 10x + 15.
CBEST Math 4
A number is increased by 40% to get 84.
What was the original number?