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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 342 · 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.Half of 98 =
  2. 2.Take 235. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.29 × 1000 =
  4. 4.Double 61 =
  5. 5.9 × 4 = 3? — what is the missing digit?
  6. 6.1 + 3 + 5 + … + 11 =
  7. 7.A father is 30 years old and his son is 8. How old was the father when the son was born?
  8. 8.1 + 2 + 3 + … + 14 =
  9. 9.45 × 1000 =
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  11. 11.10 × 9 =
  12. 12.Take 52 and take away the sum of its digits. What do you get?
  13. 13.792 + 297 =
  14. 14.7 × ? = 7000
  15. 15.9 × 7 =
  16. 16.Double 81 =
  17. 17.Odd one out: which number is NOT in the 3 times table? (a) 7 (b) 15 (c) 24 (d) 12
  18. 18.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 10 14 | 11 ? 7. What is the missing number?
  19. 19.Magic trick! Think of 11. Double it, add 18, halve it, then take away 11. What number do you get?
  20. 20.In 4 years a boy will be 18 years old. How old was he 7 years ago?
  21. 21.Double 21 =
  22. 22.12345679 × 36 =
  23. 23.9 × 3 =
  24. 24.Double 53 =
  25. 25.60 × ? = 6000
  26. 26.478 × 10 =
  27. 27.9 × 3 = 2? — what is the missing digit?
  28. 28.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Magic square (every row, column and diagonal has the same total): 25 4 19 | ? 16 22 | 13 28 7. What is the missing number?
  30. 30.123456 × 9 + 7 =
  31. 31.1 + 2 + 3 + … + 47 =
  32. 32.9 × 7 = ?3 — what is the missing digit?
  33. 33.5 × 9 =
  34. 34.Think of 13. Multiply it by 3, then add 5. What number do you end with?
  35. 35.8 × ? = 8000
  36. 36.Take 419. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  38. 38.Magic square (every row, column and diagonal has the same total): 8 18 4 | 6 ? 14 | 16 2 12. What is the missing number?
  39. 39.Take 54 and take away the sum of its digits. What do you get?
  40. 40.9 × 2 = 1? — what is the missing digit?

Answer key

  1. 49
  2. 297
  3. 29000
  4. 122
  5. 6
  6. 36
  7. 22
  8. 105
  9. 45000
  10. 594
  11. 90
  12. 45
  13. 1089
  14. 1000
  15. 63
  16. 162
  17. 7
  18. 12
  19. 9
  20. 7
  21. 42
  22. 444444444
  23. 27
  24. 106
  25. 100
  26. 4780
  27. 7
  28. 891
  29. 10
  30. 1111111
  31. 1128
  32. 6
  33. 45
  34. 44
  35. 1000
  36. 495
  37. 9
  38. 10
  39. 45
  40. 8

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