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1. Which of the following numbers is both a factor of 30 and 40?
A. 2
B. 3
C. 5
D. 7
2. Which number is neither prime nor composite?
A. 1
B. 2
C. 3
D. 4
3. Which of the following is the smallest prime number greater than 20?
A. 21
B. 23
C. 25
D. 27
4. What is the greatest common factor (GCF) of 24 and 36?
A. 6
B. 12
C. 18
D. 24
5. Which of the following is a composite number?
A. 13
B. 19
C. 27
D. 29
6. What is the least common multiple (LCM) of 4 and 6?
A. 8
B. 12
C. 18
D. 24
7. Which of the following numbers is divisible by 3?
A. 22
B. 33
C. 44
D. 55
8. How many prime numbers are there between 50 and 100?
A. 8
B. 9
C. 10
D. 11
9. Which of the following numbers is co-prime with 25?
A. 10
B. 20
C. 24
D. 26
10. Which is the prime number nearest to 60?
A. 59
B. 61
C. 63
D. 65
11. Which pair of numbers has the greatest common factor of 1?
A. 12 and 18
B. 7 and 15
C. 8 and 16
D. 10 and 20
12. What is the product of the first two prime numbers?
A. 2
B. 3
C. 5
D. 6
13. How many factors does the number 64 have?
A. 6
B. 7
C. 8
D. 9
14. Which of the following numbers is not divisible by 5?
A. 15
B. 25
C. 30
D. 32
15. Which pair of numbers is NOT co-prime?
A. 7 and 9
B. 11 and 17
C. 8 and 10
D. 5 and 13
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