ICSE Class 6 Mathematics - Playing with Numbers - Test 3 (Advanced)
1. What is the HCF of 28 and 42?
A. 7
B. 14
C. 21
2. What is the LCM of 8 and 12?
A. 12
B. 20
C. 24
3. What is the prime factorization of 60?
A. 2 x 2 x 3 x 5
B. 6 x 10
C. 3 x 20
4. Which number is divisible by 8?
A. 2,186
B. 2,184
C. 2,190
5. Which number is divisible by 11?
A. 1,234
B. 1,326
C. 1,331
6. Which pair is a pair of twin primes?
A. 17 and 19
B. 21 and 23
C. 25 and 27
7. What is the greatest common factor of 45 and 60?
A. 10
B. 15
C. 20
8. What is the least common multiple of 9 and 12?
A. 24
B. 30
C. 36
9. Two bells ring every 6 minutes and 8 minutes. After how many minutes will they ring together again?
A. 24 minutes
B. 14 minutes
C. 48 minutes
10. 24 boys and 36 girls are arranged in equal rows. What is the maximum number of rows possible?
A. 6
B. 12
C. 18
11. Which number is divisible by both 2 and 3?
A. 245
B. 247
C. 246
12. Which number is divisible by 8?
A. 1,008
B. 1,006
C. 1,004
13. What is the prime factorization of 36?
A. 4 x 9
B. 2 x 2 x 3 x 3
C. 6 x 6
14. Which pair is co-prime?
A. 12 and 18
B. 15 and 30
C. 14 and 25
15. Which number is divisible by 4?
A. 7,236
B. 7,238
C. 7,239
16. Which number is divisible by 9?
A. 5,482
B. 5,481
C. 5,487
17. Which is a common factor of 27 and 45?
A. 6
B. 8
C. 9
18. Which is a common multiple of 10 and 15?
A. 30
B. 25
C. 35
19. 32 red balls and 48 blue balls are packed equally in packets. What is the greatest number of balls that can be put in each packet?
A. 8
B. 16
C. 24
20. What is the least number divisible by both 6 and 10?
A. 20
B. 60
C. 30