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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 464 · 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. 1.9 × 9 =
  2. 2.3 × 9 =
  3. 3.12 × 4 =
  4. 4.59 × 4 =
  5. 5.Magic square (every row, column and diagonal has the same total): 12 9 24 | 27 15 3 | 6 ? 18. What is the missing number?
  6. 6.1 + 2 + 3 + … + 73 =
  7. 7.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 ? | 17 7 9. What is the missing number?
  8. 8.9 × 7 = 6? — what is the missing digit?
  9. 9.514 × 10 =
  10. 10.9 × 10 = ?0 — what is the missing digit?
  11. 11.2 × 9 =
  12. 12.297 + 792 =
  13. 13.123 × 8 + 3 =
  14. 14.In 3 years a boy will be 17 years old. How old was he 6 years ago?
  15. 15.I thought of a number, added 5 and then doubled it. I got 18. What was my number?
  16. 16.45 × ? = 45000
  17. 17.24 × 4 =
  18. 18.10?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 8 = 7? — what is the missing digit?
  20. 20.Magic square (every row, column and diagonal has the same total): 29 14 ? | 8 20 32 | 23 26 11. What is the missing number?
  21. 21.419 × 10 =
  22. 22.50 × 4 =
  23. 23.9 × 3 = 2? — what is the missing digit?
  24. 24.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  25. 25.?816 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.9 × 2 = ?8 — what is the missing digit?
  27. 27.Magic square (every row, column and diagonal has the same total): 2 ? 6 | 9 5 1 | 4 3 8. What is the missing number?
  28. 28.Do the 1089 trick with 357: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.1 + 3 + 5 + … + 41 =
  30. 30.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  31. 31.12345679 × 27 =
  32. 32.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 5 years?
  33. 33.I thought of a number, multiplied it by 3 and added 5. I got 26. What was my number?
  34. 34.1 + 3 + 5 + … + 19 =
  35. 35.32 × ? = 32000
  36. 36.Magic square (every row, column and diagonal has the same total): 6 ? 12 | 21 15 9 | 18 3 24. What is the missing number?
  37. 37.A girl is 12 years old and her brother is 2 years older. How old will her brother be in 7 years?
  38. 38.8 × 4 =
  39. 39.10 × 9 =
  40. 40.891 + 198 =

Answer key

  1. 81
  2. 27
  3. 48
  4. 236
  5. 21
  6. 2701
  7. 19
  8. 3
  9. 5140
  10. 9
  11. 18
  12. 1089
  13. 987
  14. 8
  15. 4
  16. 1000
  17. 96
  18. 4
  19. 2
  20. 17
  21. 4190
  22. 200
  23. 7
  24. 80
  25. 3
  26. 1
  27. 7
  28. 1089
  29. 441
  30. 8
  31. 333333333
  32. 17
  33. 7
  34. 100
  35. 1000
  36. 27
  37. 21
  38. 32
  39. 90
  40. 1089

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