COOP COOP Mathematics Concepts 2 — Questions and Answers
Question 1: Which of the following is a prime number?
- 9
- 15
- 21
- 29 (Correct answer)
Correct answer: 29
29 is divisible only by 1 and itself, making it a prime number.
Question 2: What is the perimeter of a square with a side length of 7 inches?
- 14 in
- 21 in
- 28 in (Correct answer)
- 49 in
Correct answer: 28 in
Perimeter of a square = 4 × side = 4 × 7 = 28 inches.
Question 3: Simplify: 36 ÷ (4 + 2) × 3
- 9
- 12
- 18 (Correct answer)
- 27
Correct answer: 18
Following order of operations: 36 ÷ 6 × 3 = 6 × 3 = 18.
Question 4: What is the median of the set {3, 7, 9, 2, 5}?
- 3
- 5 (Correct answer)
- 7
- 9
Correct answer: 5
When ordered {2, 3, 5, 7, 9}, the middle value is 5.
Question 5: A train travels 120 miles in 2 hours. What is its average speed?
- 40 mph
- 50 mph
- 60 mph (Correct answer)
- 80 mph
Correct answer: 60 mph
Speed = Distance ÷ Time = 120 ÷ 2 = 60 mph.
Question 6: What is the greatest common factor (GCF) of 24 and 36?
- 4
- 6
- 8
- 12 (Correct answer)
Correct answer: 12
The factors of 24 and 36 both include 12, which is the largest shared factor.
COOP COOP Mathematics Concepts 2
Which of the following is a prime number?