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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 586 · 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. 1.22 × ? = 22000
  2. 2.Do the 1089 trick with 459: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.Half of 192 =
  4. 4.9 × 6 = 5? — what is the missing digit?
  5. 5.9 × 3 = ?7 — what is the missing digit?
  6. 6.25 × 4 =
  7. 7.Magic square (every row, column and diagonal has the same total): 5 ? 13 | 19 11 3 | 9 7 17. What is the missing number?
  8. 8.59 × 4 =
  9. 9.9 × 8 =
  10. 10.4 × 9 =
  11. 11.In 3 years a boy will be 11 years old. How old was he 7 years ago?
  12. 12.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 56 (c) 65 (d) 48
  13. 13.What comes next? 17, 26, 35, 44, ? (a) 62 (b) 44 (c) 54 (d) 53
  14. 14.Double 86 =
  15. 15.43?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.1111 × 1111 =
  17. 17.A father is 42 years old and his son is 14. How old was the father when the son was born?
  18. 18.Double 61 =
  19. 19.If today is Monday, what day will it be after 93 days? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  20. 20.In 5 years a boy will be 17 years old. How old was he 7 years ago?
  21. 21.9 × 5 = 4? — what is the missing digit?
  22. 22.9 × 7 =
  23. 23.17 × 4 =
  24. 24.If today is Sunday, what day will it be after 85 days? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
  25. 25.9 × 3 =
  26. 26.If today is Friday, what day will it be after 12 days? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  27. 27.9 × 5 = ?5 — what is the missing digit?
  28. 28.The 8th of a month is a Friday. What day is the 30th of the same month? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  29. 29.6 × 9 =
  30. 30.34 × 4 =
  31. 31.Half of 32 =
  32. 32.If today is Wednesday, what day will it be after 22 days? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  33. 33.38 × 4 =
  34. 34.The 7th of a month is a Sunday. What day is the 24th of the same month? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  35. 35.9 × 7 = ?3 — what is the missing digit?
  36. 36.Half of 114 =
  37. 37.If today is Sunday, what day was it 32 days ago? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  38. 38.The 7th of a month is a Saturday. What day is the 22nd of the same month? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  39. 39.1 + 2 + 3 + … + 55 =
  40. 40.If today is Saturday, what day was it 14 days ago? (a) Tuesday (b) Sunday (c) Friday (d) Saturday

Answer key

  1. 1000
  2. 1089
  3. 96
  4. 4
  5. 2
  6. 100
  7. 15
  8. 236
  9. 72
  10. 36
  11. 1
  12. 64
  13. 53
  14. 172
  15. 8
  16. 1234321
  17. 28
  18. 122
  19. Wednesday
  20. 5
  21. 5
  22. 63
  23. 68
  24. Monday
  25. 27
  26. Wednesday
  27. 4
  28. Saturday
  29. 54
  30. 136
  31. 16
  32. Thursday
  33. 152
  34. Wednesday
  35. 6
  36. 57
  37. Wednesday
  38. Sunday
  39. 1540
  40. Saturday

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