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1. What is the smallest prime factor of 56?
A. 7
B. 2
C. 8
D. 5
2. The number 6 has how many factors?
A. 2
B. 3
C. 4
D. 5
3. Which of the following numbers is divisible by 3?
A. 14
B. 21
C. 25
D. 22
4. What is the largest prime number less than 20?
A. 19
B. 18
C. 17
D. 16
5. The sum of two prime numbers is always:
A. Even
B. Odd
C. Prime
D. None of these
6. Which of the following pairs is co-prime?
A. 20 and 24
B. 5 and 16
C. 30 and 45
D. 28 and 35
7. A prime number between 30 and 40 is:
A. 31
B. 32
C. 33
D. 34
8. How many factors does 100 have?
A. 5
B. 9
C. 10
D. 12
9. What is the prime factorization of 100?
A. 10 × 10
B. 2 × 2 × 5 × 5
C. 20 × 5
D. 4 × 25
10. What is the greatest common factor of 15 and 30?
A. 15
B. 10
C. 5
D. 20
11. What is the least common multiple of 6 and 8?
A. 24
B. 48
C. 36
D. 12
12. Which of the following is a factor of 24?
A. 5
B. 7
C. 8
D. 10
13. What is the prime factorization of 50?
A. 2 × 5 × 5
B. 2 × 10
C. 10 × 5
D. 25 × 2
14. Which of the following pairs has no common factors?
A. 9 and 15
B. 12 and 30
C. 4 and 9
D. 20 and 25
15. The number of prime numbers between 1 and 10 is:
A. 3
B. 4
C. 5
D. 6
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