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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 241 · 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.A father is 42 years old and his son is 5. How old was the father when the son was born?
  2. 2.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  3. 3.9 × 3 = 2? — what is the missing digit?
  4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  5. 5.48 × 4 =
  6. 6.495 + 594 =
  7. 7.1 + 3 + 5 + … + 43 =
  8. 8.2 × 9 =
  9. 9.1 + 2 + 3 + … + 62 =
  10. 10.12345678 × 9 + 9 =
  11. 11.37 × 6 =
  12. 12.1 + 2 + 3 + … + 51 =
  13. 13.9 × 3 =
  14. 14.Magic square (every row, column and diagonal has the same total): ? 26 16 | 22 18 14 | 20 10 24. What is the missing number?
  15. 15.20 × 4 =
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.A father is 41 years old and his son is 9. How old was the father when the son was born?
  18. 18.9 × 9 =
  19. 19.Magic square (every row, column and diagonal has the same total): 5 15 13 | ? 11 3 | 9 7 17. What is the missing number?
  20. 20.198 + 891 =
  21. 21.Take 34 and take away the sum of its digits. What do you get?
  22. 22.Double 77 =
  23. 23.Double 81 =
  24. 24.12345679 × 45 =
  25. 25.Half of 42 =
  26. 26.1 + 2 + 3 + … + 82 =
  27. 27.45 × 4 =
  28. 28.48 × 1000 =
  29. 29.471 × 10 =
  30. 30.6?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.123 × 9 + 4 =
  32. 32.1 + 2 + 3 + … + 20 =
  33. 33.56 × ? = 560
  34. 34.68 × 100 =
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.13 × 4 =
  37. 37.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 12 (d) 17
  38. 38.1 + 2 + 3 + … + 22 =
  39. 39.Magic trick! Think of 11. Double it, add 14, halve it, then take away 11. What number do you get?
  40. 40.284 × 10 =

Answer key

  1. 37
  2. 9
  3. 7
  4. 891
  5. 192
  6. 1089
  7. 484
  8. 18
  9. 1953
  10. 111111111
  11. 222
  12. 1326
  13. 27
  14. 12
  15. 80
  16. 1
  17. 32
  18. 81
  19. 19
  20. 1089
  21. 27
  22. 154
  23. 162
  24. 555555555
  25. 21
  26. 3403
  27. 180
  28. 48000
  29. 4710
  30. 5
  31. 1111
  32. 210
  33. 10
  34. 6800
  35. 2
  36. 52
  37. 16
  38. 253
  39. 7
  40. 2840

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