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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 469 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.Take 163. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.9 × 2 =
  3. 3.1 + 3 + 5 + … + 17 =
  4. 4.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 64 (d) 62
  5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  6. 6.9 × 2 = 1? — what is the missing digit?
  7. 7.In 3 years a boy will be 14 years old. How old was he 6 years ago?
  8. 8.What comes next? 15, 17, 19, 21, ? (a) 25 (b) 24 (c) 23 (d) 21
  9. 9.8 × 9 =
  10. 10.16 × 4 =
  11. 11.1 + 2 + 3 + … + 47 =
  12. 12.10 × 9 =
  13. 13.What comes next? 10, 18, 26, 34, ? (a) 43 (b) 50 (c) 34 (d) 42
  14. 14.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 81 (d) 83
  15. 15.The 6th of a month is a Friday. What day is the 29th of the same month? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
  16. 16.What comes next? 10, 13, 16, 19, ? (a) 23 (b) 22 (c) 19 (d) 25
  17. 17.9 × 3 = ?7 — what is the missing digit?
  18. 18.14 × 4 =
  19. 19.9 × 6 =
  20. 20.123456 × 9 + 7 =
  21. 21.The 1st of a month is a Friday. What day is the 15th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday
  22. 22.Take 730. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.80 × ? = 8000
  24. 24.37 × 3 =
  25. 25.Take 18 and take away the sum of its digits. What do you get?
  26. 26.Take 40 and take away the sum of its digits. What do you get?
  27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  28. 28.1 + 2 + 3 + … + 19 =
  29. 29.12345679 × 9 =
  30. 30.9 × 7 =
  31. 31.Double 49 =
  32. 32.Think of 9. Multiply it by 3, then add 9. What number do you end with?
  33. 33.9 × 10 =
  34. 34.12345679 × 81 =
  35. 35.What comes next? 16, 22, 28, 34, ? (a) 34 (b) 46 (c) 40 (d) 41
  36. 36.12 × 100 =
  37. 37.41 × 4 =
  38. 38.9 × 6 = ?4 — what is the missing digit?
  39. 39.Think of 4. Multiply it by 2, then add 9. What number do you end with?
  40. 40.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24

Answer key

  1. 198
  2. 18
  3. 81
  4. 64
  5. 594
  6. 8
  7. 5
  8. 23
  9. 72
  10. 64
  11. 1128
  12. 90
  13. 42
  14. 81
  15. Sunday
  16. 22
  17. 2
  18. 56
  19. 54
  20. 1111111
  21. Friday
  22. 693
  23. 100
  24. 111
  25. 9
  26. 36
  27. 891
  28. 190
  29. 111111111
  30. 63
  31. 98
  32. 36
  33. 90
  34. 999999999
  35. 40
  36. 1200
  37. 164
  38. 5
  39. 17
  40. 32

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