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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 391 · 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.If today is Wednesday, what day was it 57 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  2. 2.Take 953. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.9 × 6 =
  4. 4.1 + 3 + 5 + … + 23 =
  5. 5.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 16 (d) 17
  6. 6.Take 18 and take away the sum of its digits. What do you get?
  7. 7.I thought of a number, multiplied it by 4 and added 3. I got 27. What was my number?
  8. 8.Half of 56 =
  9. 9.Take 17 and take away the sum of its digits. What do you get?
  10. 10.Do the 1089 trick with 710: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.9 × 5 = 4? — what is the missing digit?
  12. 12.1 + 3 + 5 + … + 17 =
  13. 13.123456789 × 8 + 9 =
  14. 14.The 3rd of a month is a Tuesday. What day is the 13th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  15. 15.9 × 2 = ?8 — what is the missing digit?
  16. 16.123 × 8 + 3 =
  17. 17.Magic square (every row, column and diagonal has the same total): 10 15 8 | 9 ? 13 | 14 7 12. What is the missing number?
  18. 18.6 × 9 =
  19. 19.If today is Monday, what day will it be after 96 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  20. 20.Half of 32 =
  21. 21.247 × 10 =
  22. 22.In 4 years a boy will be 17 years old. How old was he 3 years ago?
  23. 23.Take 580. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.1 + 2 + 3 + … + 14 =
  25. 25.Take 64 and take away the sum of its digits. What do you get?
  26. 26.Magic square (every row, column and diagonal has the same total): 32 11 26 | 17 23 29 | 20 ? 14. What is the missing number?
  27. 27.Take 267. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.I thought of a number, multiplied it by 2 and added 5. I got 11. What was my number?
  29. 29.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
  30. 30.Magic square (every row, column and diagonal has the same total): 25 ? 13 | 4 16 28 | 19 22 7. What is the missing number?
  31. 31.198 + 891 =
  32. 32.119 × 10 =
  33. 33.9 × 7 = 6? — what is the missing digit?
  34. 34.?039 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.7 × 9 =
  37. 37.2 × 9 =
  38. 38.Half of 72 =
  39. 39.1111 × 1111 =
  40. 40.491 × ? = 4910

Answer key

  1. Tuesday
  2. 594
  3. 54
  4. 144
  5. 16
  6. 9
  7. 6
  8. 28
  9. 9
  10. 1089
  11. 5
  12. 81
  13. 987654321
  14. Friday
  15. 1
  16. 987
  17. 11
  18. 54
  19. Saturday
  20. 16
  21. 2470
  22. 10
  23. 495
  24. 105
  25. 54
  26. 35
  27. 495
  28. 3
  29. 7
  30. 10
  31. 1089
  32. 1190
  33. 3
  34. 6
  35. 8
  36. 63
  37. 18
  38. 36
  39. 1234321
  40. 10

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