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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 106 · 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. 1.198 + 891 =
  2. 2.In 3 years a boy will be 12 years old. How old was he 3 years ago?
  3. 3.Double 81 =
  4. 4.28 × 100 =
  5. 5.10 × 9 =
  6. 6.If today is Monday, what day will it be after 33 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  7. 7.9 × 6 = 5? — what is the missing digit?
  8. 8.74 × ? = 7400
  9. 9.59 × 4 =
  10. 10.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 66 (c) 64 (d) 65
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  12. 12.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 83 (d) 82
  13. 13.1 + 3 + 5 + … + 37 =
  14. 14.75?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.1234 × 8 + 4 =
  16. 16.1 + 2 + 3 + … + 94 =
  17. 17.290? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 6 4 | 3 ? 5. What is the missing number?
  19. 19.7 × 9 =
  20. 20.40 × 4 =
  21. 21.312 × 10 =
  22. 22.Do the 1089 trick with 377: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.12 × 8 + 2 =
  24. 24.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 11 | 10 ? 6. What is the missing number?
  25. 25.800? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Double 39 =
  27. 27.Think of 7. Multiply it by 5, then add 7. What number do you end with?
  28. 28.Magic square (every row, column and diagonal has the same total): 6 7 2 | 1 5 9 | 8 3 ?. What is the missing number?
  29. 29.9 × 8 = ?2 — what is the missing digit?
  30. 30.9 × 4 = ?6 — what is the missing digit?
  31. 31.81 × ? = 8100
  32. 32.Think of 15. Multiply it by 4, then add 6. What number do you end with?
  33. 33.A father is 44 years old and his son is 9. How old was the father when the son was born?
  34. 34.89 × 100 =
  35. 35.9 × 9 = ?1 — what is the missing digit?
  36. 36.The 2nd of a month is a Wednesday. What day is the 13th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  37. 37.37 × 15 =
  38. 38.46 × 1000 =
  39. 39.Half of 52 =
  40. 40.In 3 years a boy will be 17 years old. How old was he 6 years ago?

Answer key

  1. 1089
  2. 6
  3. 162
  4. 2800
  5. 90
  6. Saturday
  7. 4
  8. 100
  9. 236
  10. 64
  11. 198
  12. 81
  13. 361
  14. 8
  15. 9876
  16. 4465
  17. 7
  18. 10
  19. 63
  20. 160
  21. 3120
  22. 1089
  23. 98
  24. 5
  25. 1
  26. 78
  27. 42
  28. 4
  29. 7
  30. 3
  31. 100
  32. 66
  33. 35
  34. 8900
  35. 8
  36. Sunday
  37. 555
  38. 46000
  39. 26
  40. 8

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