Answer Key – Prime Time
A. MCQs:
- b 2. c 3. a 4. b 5. c 6. b
B. Fill in the blanks:
7. 1, 17 8. prime, composite 9. 2, 3, 5, 7, 11 10. 4 11. 0
C. True/False:
12. True 13. False 14. True 15. False
D. Find/Classify:
16. 1, 2, 3, 4, 6, 8, 12, 24
17. 1, 2, 3, 4, 6, 9, 12, 18, 36
18. 11, 13, 17, 19, 23, 29
19. 31–P, 42–C, 47–P, 51–C, 57–C
20. 7, 14, 21, 28, 35, 42
E. Solve:
21. 1, 2, 3, 6
22. 60 = 2 × 2 × 3 × 5 = 2² × 3 × 5
23. Divisible by 3: Yes; 5: Yes; 9: Yes
F. Think & Answer:
24. 19
25. No. Example: 5 is divisible by 5 but is prime.
G : (2,3), (4,9)