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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 740 · 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. 1.1 + 2 + 3 + … + 8 =
  2. 2.37 × 3 =
  3. 3.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 ? 23 | 21 11 13. What is the missing number?
  4. 4.88?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Half of 162 =
  6. 6.9 × 9 = ?1 — what is the missing digit?
  7. 7.In 6 years a boy will be 15 years old. How old was he 7 years ago?
  8. 8.10 × 9 =
  9. 9.If today is Wednesday, what day was it 31 days ago? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  10. 10.I thought of a number, added 1 and then doubled it. I got 36. What was my number?
  11. 11.The ages of two twins add up to 30. How old is each twin?
  12. 12.I thought of a number, multiplied it by 3 and added 2. I got 11. What was my number?
  13. 13.Do the 1089 trick with 250: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.967 × ? = 9670
  15. 15.13 × 4 =
  16. 16.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 3 years?
  17. 17.1 + 3 + 5 + … + 19 =
  18. 18.14 × 4 =
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.9 × 4 = ?6 — what is the missing digit?
  21. 21.Half of 32 =
  22. 22.I thought of a number, multiplied it by 4 and added 5. I got 13. What was my number?
  23. 23.If today is Tuesday, what day will it be after 38 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
  24. 24.What comes next? 8, 11, 14, 17, ? (a) 17 (b) 21 (c) 20 (d) 23
  25. 25.5 × 9 =
  26. 26.Do the 1089 trick with 740: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.17 × 4 =
  28. 28.78 × 100 =
  29. 29.The 8th of a month is a Wednesday. What day is the 24th of the same month? (a) Friday (b) Thursday (c) Saturday (d) Monday
  30. 30.Do the 1089 trick with 811: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  32. 32.1234567 × 9 + 8 =
  33. 33.949 × 10 =
  34. 34.9 × 3 =
  35. 35.1 + 3 + 5 + … + 45 =
  36. 36.48 × ? = 4800
  37. 37.1 + 2 + 3 + … + 9 =
  38. 38.9 × 4 = 3? — what is the missing digit?
  39. 39.54 × 4 =
  40. 40.Magic square (every row, column and diagonal has the same total): ? 16 6 | 4 12 20 | 18 8 10. What is the missing number?

Answer key

  1. 36
  2. 111
  3. 15
  4. 2
  5. 81
  6. 8
  7. 2
  8. 90
  9. Sunday
  10. 17
  11. 15
  12. 3
  13. 1089
  14. 10
  15. 52
  16. 12
  17. 100
  18. 56
  19. 3
  20. 3
  21. 16
  22. 2
  23. Friday
  24. 20
  25. 45
  26. 1089
  27. 68
  28. 7800
  29. Friday
  30. 1089
  31. 495
  32. 11111111
  33. 9490
  34. 27
  35. 529
  36. 100
  37. 45
  38. 6
  39. 216
  40. 14

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