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Number Series Worksheet for Maths Olympiad

Maths Olympiad topic 2: Number patterns: what comes next? · Set 51 · 40 questions
TalentJR

How to solve it (Look at the gaps): Look at two numbers side by side and find the jump: 5 → 10 is a jump of +5. Is the jump the same every time? Then add the same jump once more to the last number. Going down? Take away the same jump. Harder patterns: the jump can grow (+2, +3, +4 …) or the numbers can double (2, 4, 8, 16 …).

NameDateTime takenScore ___ / 40
  1. 1.What comes next? 2, 9, 8, 15, 14, 21, ? (a) 20 (b) 28 (c) 22 (d) 19
  2. 2.What comes next? 50, 45, 40, 35, 30, ? (a) 20 (b) 26 (c) 24 (d) 25
  3. 3.What comes next? 35, 33, 31, 29, 27, ? (a) 26 (b) 25 (c) 23 (d) 24
  4. 4.What comes next? 3, 9, 27, 81, ? (a) 135 (b) 243 (c) 270 (d) 216
  5. 5.What comes next? 21, 32, 43, 54, 65, ? (a) 87 (b) 76 (c) 75 (d) 77
  6. 6.What comes next? 10, 13, 16, 19, 22, ? (a) 28 (b) 26 (c) 24 (d) 25
  7. 7.What comes next? 25, 35, 45, 55, 65, ? (a) 85 (b) 74 (c) 76 (d) 75
  8. 8.What comes next? 11, 15, 20, 26, 33, ? (a) 41 (b) 42 (c) 40 (d) 43
  9. 9.What comes next? 17, 20, 24, 29, 35, ? (a) 43 (b) 41 (c) 44 (d) 42
  10. 10.What comes next? 4, 8, 16, 32, 64, ? (a) 160 (b) 96 (c) 129 (d) 128
  11. 11.What comes next? 14, 18, 23, 29, 36, ? (a) 43 (b) 45 (c) 46 (d) 44
  12. 12.What comes next? 3, 6, 12, 24, 48, ? (a) 96 (b) 72 (c) 97 (d) 120
  13. 13.What comes next? 4, 8, 13, 19, 26, ? (a) 36 (b) 35 (c) 33 (d) 34
  14. 14.What comes next? 30, 34, 38, 42, 46, ? (a) 49 (b) 50 (c) 51 (d) 54
  15. 15.What comes next? 2, 6, 18, 54, ? (a) 144 (b) 90 (c) 180 (d) 162
  16. 16.What comes next? 18, 22, 26, 30, 34, ? (a) 37 (b) 39 (c) 38 (d) 42
  17. 17.What comes next? 30, 37, 44, 51, 58, ? (a) 72 (b) 66 (c) 65 (d) 64
  18. 18.What comes next? 20, 29, 26, 35, 32, 41, ? (a) 44 (b) 50 (c) 38 (d) 37
  19. 19.What comes next? 56, 48, 40, 32, 24, ? (a) 17 (b) 16 (c) 15 (d) 8
  20. 20.What comes next? 20, 22, 25, 29, 34, ? (a) 39 (b) 42 (c) 41 (d) 40
  21. 21.What comes next? 2, 11, 20, 29, 38, ? (a) 47 (b) 46 (c) 56 (d) 48
  22. 22.What comes next? 7, 13, 9, 15, 11, 17, ? (a) 13 (b) 12 (c) 23 (d) 21
  23. 23.What comes next? 30, 28, 26, 24, 22, ? (a) 19 (b) 21 (c) 20 (d) 18
  24. 24.What comes next? 68, 59, 50, 41, 32, ? (a) 24 (b) 23 (c) 22 (d) 14
  25. 25.What comes next? 56, 47, 38, 29, 20, ? (a) 11 (b) 12 (c) 10 (d) 2
  26. 26.What comes next? 5, 9, 13, 17, 21, ? (a) 29 (b) 24 (c) 25 (d) 26
  27. 27.What comes next? 2, 11, 7, 16, 12, 21, ? (a) 25 (b) 30 (c) 16 (d) 17
  28. 28.What comes next? 1, 3, 9, 27, ? (a) 45 (b) 90 (c) 81 (d) 72
  29. 29.What comes next? 14, 17, 21, 26, 32, ? (a) 38 (b) 39 (c) 41 (d) 40
  30. 30.What comes next? 19, 23, 28, 34, 41, ? (a) 50 (b) 51 (c) 49 (d) 48
  31. 31.What comes next? 20, 24, 23, 27, 26, 30, ? (a) 29 (b) 31 (c) 28 (d) 34
  32. 32.What comes next? 13, 22, 31, 40, 49, ? (a) 67 (b) 57 (c) 59 (d) 58
  33. 33.What comes next? 21, 19, 17, 15, 13, ? (a) 11 (b) 12 (c) 9 (d) 10
  34. 34.What comes next? 15, 20, 19, 24, 23, 28, ? (a) 26 (b) 29 (c) 33 (d) 27
  35. 35.What comes next? 17, 20, 18, 21, 19, 22, ? (a) 19 (b) 24 (c) 20 (d) 25
  36. 36.What comes next? 5, 7, 10, 14, 19, ? (a) 27 (b) 25 (c) 24 (d) 26
  37. 37.What comes next? 50, 43, 36, 29, 22, ? (a) 15 (b) 16 (c) 8 (d) 14
  38. 38.What comes next? 14, 23, 15, 24, 16, 25, ? (a) 17 (b) 33 (c) 16 (d) 34
  39. 39.What comes next? 20, 25, 24, 29, 28, 33, ? (a) 34 (b) 32 (c) 31 (d) 38
  40. 40.What comes next? 11, 18, 17, 24, 23, 30, ? (a) 31 (b) 28 (c) 29 (d) 37

Answer key

  1. 20
  2. 25
  3. 25
  4. 243
  5. 76
  6. 25
  7. 75
  8. 41
  9. 42
  10. 128
  11. 44
  12. 96
  13. 34
  14. 50
  15. 162
  16. 38
  17. 65
  18. 38
  19. 16
  20. 40
  21. 47
  22. 13
  23. 20
  24. 23
  25. 11
  26. 25
  27. 17
  28. 81
  29. 39
  30. 49
  31. 29
  32. 58
  33. 11
  34. 27
  35. 20
  36. 25
  37. 15
  38. 17
  39. 32
  40. 29

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