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Find the Odd One Out – Numbers

20 Questions | Identify the number that does not belong to the group

1. 12, 24, 36, 48, 58

A) 12 B) 24 C) 36 D) 58

2. 7, 11, 13, 17, 21

A) 7 B) 21 C) 13 D) 17

3. 16, 25, 36, 49, 64, 80

A) 16 B) 25 C) 80 D) 64

4. 3, 7, 12, 19, 28

A) 12 B) 7 C) 19 D) 28

5. 81, 64, 49, 36, 25, 16, 9

A) 81 B) 64 C) 9 D) 16

6. 2, 3, 5, 7, 11, 14

A) 2 B) 14 C) 5 D) 11

7. 144, 121, 100, 81, 65

A) 144 B) 65 C) 100 D) 81

8. 15, 25, 35, 45, 55, 65

A) 15 B) 25 C) 35 D) 65

9. 8, 27, 64, 125, 216, 343, 512

A) 8 B) 27 C) 216 D) 343

10. 10, 20, 30, 40, 51

A) 10 B) 20 C) 51 D) 40

11. 4, 9, 25, 49, 121

A) 4 B) 9 C) 25 D) 121

12. 112, 210, 316, 510, 714

A) 112 B) 316 C) 510 D) 714

13. 2, 6, 12, 20, 30, 42

A) 2 B) 12 C) 20 D) 42

14. 128, 64, 32, 16, 8, 4, 3

A) 128 B) 3 C) 16 D) 4

15. 99, 198, 297, 396, 495, 594

A) 99 B) 396 C) 495 D) 594

16. 11, 22, 33, 44, 55, 66, 78

A) 11 B) 22 C) 78 D) 66

17. 50, 41, 32, 23, 14, 5

A) 50 B) 5 C) 23 D) 14

18. 625, 500, 375, 250, 125, 75

A) 625 B) 75 C) 250 D) 125

19. 13, 17, 19, 23, 29, 37

A) 13 B) 17 C) 19 D) 37

20. 24, 48, 72, 96, 108

A) 24 B) 108 C) 72 D) 96

Your Score: 0/20

Correct Answers (Odd One Out)

1. D) 58 (others divisible by 12)

2. B) 21 (others are prime)

3. C) 80 (others are perfect squares)

4. A) 12 (difference pattern 4,5,7,9 → 12 breaks)

5. C) 9 (others are squares of even numbers)

6. B) 14 (others are prime)

7. B) 65 (others are perfect squares)

8. D) 65 (others end with 5)

9. C) 216 (6³, others are consecutive cubes except 216)

10. C) 51 (others divisible by 10)

11. C) 25 (others are prime squares)

12. B) 316 (others follow n(n+1) pattern)

13. C) 20 (others are n(n+1))

14. B) 3 (others are powers of 2)

15. C) 495 (others divisible by 99)

16. C) 78 (others divisible by 11)

17. B) 5 (others decrease by 9)

18. B) 75 (others divisible by 125)

19. D) 37 (others are prime numbers less than 30)

20. B) 108 (others divisible by 24)

© 2025 | Odd One Out – Number Series Test (English)