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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 400 · 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 59 and take away the sum of its digits. What do you get?
  2. 2.58 × 4 =
  3. 3.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 40 (c) 25 (d) 26
  4. 4.1 + 3 + 5 + … + 13 =
  5. 5.Magic square (every row, column and diagonal has the same total): 27 6 21 | 12 18 24 | ? 30 9. What is the missing number?
  6. 6.Double 38 =
  7. 7.9 × 4 = ?6 — what is the missing digit?
  8. 8.I thought of a number, multiplied it by 5 and added 2. I got 57. What was my number?
  9. 9.45 × 4 =
  10. 10.If today is Friday, what day was it 8 days ago? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  11. 11.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 82 (d) 83
  12. 12.297 + 792 =
  13. 13.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 28 (c) 24 (d) 39
  14. 14.19 × 4 =
  15. 15.9 × 7 = 6? — what is the missing digit?
  16. 16.If today is Monday, what day was it 26 days ago? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  17. 17.43 × 4 =
  18. 18.11 × 11 =
  19. 19.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  20. 20.Take 53 and take away the sum of its digits. What do you get?
  21. 21.17 × 4 =
  22. 22.5?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Do the 1089 trick with 552: reverse and subtract, then reverse that answer and add. What do you get?
  24. 24.Magic square (every row, column and diagonal has the same total): 25 10 ? | 4 16 28 | 19 22 7. What is the missing number?
  25. 25.260 × 10 =
  26. 26.12345679 × 36 =
  27. 27.81 × ? = 8100
  28. 28.2 × 9 =
  29. 29.1 + 2 + 3 + … + 30 =
  30. 30.A father is 31 years old and his son is 6. How old was the father when the son was born?
  31. 31.1 + 3 + 5 + … + 29 =
  32. 32.Half of 116 =
  33. 33.9 × 2 = ?8 — what is the missing digit?
  34. 34.45 × ? = 4500
  35. 35.10 × 9 =
  36. 36.9 × 8 = 7? — what is the missing digit?
  37. 37.1 + 2 + 3 + … + 92 =
  38. 38.?754 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.A father is 37 years old and his son is 14. How old was the father when the son was born?
  40. 40.Double 17 =

Answer key

  1. 45
  2. 232
  3. 26
  4. 49
  5. 15
  6. 76
  7. 3
  8. 11
  9. 180
  10. Thursday
  11. 81
  12. 1089
  13. 39
  14. 76
  15. 3
  16. Wednesday
  17. 172
  18. 121
  19. 80
  20. 45
  21. 68
  22. 8
  23. 1089
  24. 13
  25. 2600
  26. 444444444
  27. 100
  28. 18
  29. 465
  30. 25
  31. 225
  32. 58
  33. 1
  34. 100
  35. 90
  36. 2
  37. 4278
  38. 2
  39. 23
  40. 34

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