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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 328 · 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. 1.79?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.What comes next? 9, 18, 27, 36, ? (a) 54 (b) 46 (c) 36 (d) 45
  3. 3.9 × 7 = ?3 — what is the missing digit?
  4. 4.Half of 128 =
  5. 5.9 × 8 = ?2 — what is the missing digit?
  6. 6.Take 269. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.Half of 22 =
  8. 8.9 × 1 =
  9. 9.5 × 9 =
  10. 10.I thought of a number, multiplied it by 3 and added 8. I got 29. What was my number?
  11. 11.23 × 4 =
  12. 12.In 5 years a boy will be 14 years old. How old was he 6 years ago?
  13. 13.793 × 10 =
  14. 14.Half of 96 =
  15. 15.Magic trick! Think of 20. Double it, add 16, halve it, then take away 20. What number do you get?
  16. 16.4 × 9 =
  17. 17.38 × 4 =
  18. 18.In 5 years a boy will be 13 years old. How old was he 2 years ago?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  20. 20.12345679 × 27 =
  21. 21.9 × 3 = ?7 — what is the missing digit?
  22. 22.71 × 100 =
  23. 23.Take 822. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.8 × 9 =
  25. 25.9 × 7 =
  26. 26.495 + 594 =
  27. 27.11 × 11 =
  28. 28.1 + 3 + 5 + … + 35 =
  29. 29.9 × 2 = ?8 — what is the missing digit?
  30. 30.Half of 18 =
  31. 31.If today is Tuesday, what day was it 20 days ago? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  32. 32.9 × 2 =
  33. 33.Magic square (every row, column and diagonal has the same total): 5 12 ? | 10 8 6 | 9 4 11. What is the missing number?
  34. 34.Take 11 and take away the sum of its digits. What do you get?
  35. 35.294 × ? = 2940
  36. 36.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 66 (c) 65 (d) 62
  37. 37.12345 × 9 + 6 =
  38. 38.A father is 31 years old and his son is 11. How old was the father when the son was born?
  39. 39.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
  40. 40.Magic square (every row, column and diagonal has the same total): 15 36 21 | 30 24 18 | 27 12 ?. What is the missing number?

Answer key

  1. 4
  2. 45
  3. 6
  4. 64
  5. 7
  6. 693
  7. 11
  8. 9
  9. 45
  10. 7
  11. 92
  12. 3
  13. 7930
  14. 48
  15. 8
  16. 36
  17. 152
  18. 6
  19. 396
  20. 333333333
  21. 2
  22. 7100
  23. 594
  24. 72
  25. 63
  26. 1089
  27. 121
  28. 324
  29. 1
  30. 9
  31. Wednesday
  32. 18
  33. 7
  34. 9
  35. 10
  36. 64
  37. 111111
  38. 20
  39. 11
  40. 33

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