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Number Series Worksheet for Maths Olympiad

Maths Olympiad topic 2: Number patterns: what comes next? · Set 81 · 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? 1, 3, 9, 27, ? (a) 90 (b) 72 (c) 81 (d) 45
  2. 2.What comes next? 3, 9, 27, 81, ? (a) 135 (b) 243 (c) 270 (d) 216
  3. 3.What comes next? 11, 15, 13, 17, 15, 19, ? (a) 16 (b) 17 (c) 21 (d) 23
  4. 4.What comes next? 27, 22, 17, 12, 7, ? (a) 3 (b) 2 (c) 4 (d) 1
  5. 5.What comes next? 2, 9, 16, 23, 30, ? (a) 37 (b) 36 (c) 38 (d) 44
  6. 6.What comes next? 10, 12, 15, 19, 24, ? (a) 31 (b) 30 (c) 29 (d) 32
  7. 7.What comes next? 5, 10, 9, 14, 13, 18, ? (a) 19 (b) 16 (c) 17 (d) 23
  8. 8.What comes next? 13, 14, 16, 19, 23, ? (a) 30 (b) 28 (c) 27 (d) 29
  9. 9.What comes next? 7, 8, 10, 13, 17, ? (a) 23 (b) 24 (c) 21 (d) 22
  10. 10.What comes next? 12, 17, 13, 18, 14, 19, ? (a) 23 (b) 14 (c) 15 (d) 24
  11. 11.What comes next? 11, 18, 25, 32, 39, ? (a) 47 (b) 45 (c) 53 (d) 46
  12. 12.What comes next? 6, 11, 16, 21, 26, ? (a) 31 (b) 32 (c) 36 (d) 30
  13. 13.What comes next? 20, 21, 23, 26, 30, ? (a) 35 (b) 34 (c) 36 (d) 37
  14. 14.What comes next? 2, 4, 8, 16, 32, ? (a) 65 (b) 48 (c) 80 (d) 64
  15. 15.What comes next? 5, 10, 20, 40, 80, ? (a) 120 (b) 161 (c) 160 (d) 200
  16. 16.What comes next? 12, 15, 19, 24, 30, ? (a) 36 (b) 37 (c) 38 (d) 39
  17. 17.What comes next? 70, 61, 52, 43, 34, ? (a) 24 (b) 16 (c) 25 (d) 26
  18. 18.What comes next? 15, 18, 17, 20, 19, 22, ? (a) 21 (b) 23 (c) 20 (d) 25
  19. 19.What comes next? 1, 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 32 (d) 40
  20. 20.What comes next? 15, 22, 20, 27, 25, 32, ? (a) 39 (b) 34 (c) 30 (d) 29
  21. 21.What comes next? 3, 11, 9, 17, 15, 23, ? (a) 21 (b) 31 (c) 20 (d) 25
  22. 22.What comes next? 9, 13, 18, 24, 31, ? (a) 40 (b) 38 (c) 41 (d) 39
  23. 23.What comes next? 6, 12, 24, 48, 96, ? (a) 240 (b) 144 (c) 192 (d) 193
  24. 24.What comes next? 3, 10, 17, 24, 31, ? (a) 38 (b) 37 (c) 45 (d) 39
  25. 25.What comes next? 20, 22, 25, 29, 34, ? (a) 39 (b) 41 (c) 42 (d) 40
  26. 26.What comes next? 4, 7, 11, 16, 22, ? (a) 29 (b) 28 (c) 30 (d) 31
  27. 27.What comes next? 16, 20, 19, 23, 22, 26, ? (a) 27 (b) 24 (c) 25 (d) 30
  28. 28.What comes next? 15, 16, 18, 21, 25, ? (a) 30 (b) 29 (c) 32 (d) 31
  29. 29.What comes next? 6, 9, 8, 11, 10, 13, ? (a) 16 (b) 14 (c) 11 (d) 12
  30. 30.What comes next? 16, 18, 21, 25, 30, ? (a) 37 (b) 36 (c) 35 (d) 38
  31. 31.What comes next? 18, 25, 21, 28, 24, 31, ? (a) 27 (b) 38 (c) 35 (d) 26
  32. 32.What comes next? 20, 28, 36, 44, 52, ? (a) 59 (b) 61 (c) 60 (d) 68
  33. 33.What comes next? 12, 20, 18, 26, 24, 32, ? (a) 30 (b) 40 (c) 34 (d) 29
  34. 34.What comes next? 7, 9, 11, 13, 15, ? (a) 17 (b) 18 (c) 19 (d) 16
  35. 35.What comes next? 13, 25, 37, 49, 61, ? (a) 74 (b) 85 (c) 72 (d) 73
  36. 36.What comes next? 2, 6, 18, 54, ? (a) 180 (b) 162 (c) 90 (d) 144
  37. 37.What comes next? 19, 21, 24, 28, 33, ? (a) 39 (b) 40 (c) 38 (d) 41
  38. 38.What comes next? 12, 16, 21, 27, 34, ? (a) 44 (b) 41 (c) 43 (d) 42
  39. 39.What comes next? 66, 58, 50, 42, 34, ? (a) 26 (b) 18 (c) 25 (d) 27
  40. 40.What comes next? 42, 35, 28, 21, 14, ? (a) 6 (b) 7 (c) 9 (d) 8

Answer key

  1. 81
  2. 243
  3. 17
  4. 2
  5. 37
  6. 30
  7. 17
  8. 28
  9. 22
  10. 15
  11. 46
  12. 31
  13. 35
  14. 64
  15. 160
  16. 37
  17. 25
  18. 21
  19. 32
  20. 30
  21. 21
  22. 39
  23. 192
  24. 38
  25. 40
  26. 29
  27. 25
  28. 30
  29. 12
  30. 36
  31. 27
  32. 60
  33. 30
  34. 17
  35. 73
  36. 162
  37. 39
  38. 42
  39. 26
  40. 7

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