Quiz

Which of the following is a prime number?

• A. 15
• B. 21
• C. 31
• D. 49

What is the prime factorization of 36?

• A. 2 × 2 × 3 × 3
• B. 2 × 3 × 6
• C. 3 × 3 × 4
• D. 2 × 3 × 3

Which of the following numbers is a composite number?

• A. 11
• B. 17
• C. 23
• D. 28

What is the greatest common divisor (GCD) of 24 and 36?

• A. 6
• B. 8
• C. 12
• D. 18

Which of the following pairs of numbers are co-prime?

• A. 14 and 21
• B. 15 and 28
• C. 16 and 24
• D. 18 and 27

What is the least common multiple (LCM) of 6 and 8?

• A. 12
• B. 18
• C. 24
• D. 36

Which number is a factor of 56?

• A. 7
• B. 9
• C. 11
• D. 13

If a number is divisible by both 2 and 3, it must also be divisible by:

• A. 4
• B. 5
• C. 6
• D. 8

What is the prime factorization of 45?

• A. 3 × 3 × 5
• B. 2 × 3 × 3
• C. 3 × 5 × 7
• D. 5 × 5 × 9

Which of the following statements is true about the number 1?

• A. It is a prime number
• B. It is a composite number
• C. It is neither prime nor composite
• D. It is both prime and composite