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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 573 · 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.Magic square (every row, column and diagonal has the same total): 13 6 11 | 8 10 ? | 9 14 7. What is the missing number?
  2. 2.1 × 9 =
  3. 3.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 ? | 12 5 10. What is the missing number?
  4. 4.Magic square (every row, column and diagonal has the same total): 11 12 ? | 6 10 14 | 13 8 9. What is the missing number?
  5. 5.Take 53 and take away the sum of its digits. What do you get?
  6. 6.22 × 4 =
  7. 7.33 × 100 =
  8. 8.7 × 4 =
  9. 9.Do the 1089 trick with 397: reverse and subtract, then reverse that answer and add. What do you get?
  10. 10.Take 81 and take away the sum of its digits. What do you get?
  11. 11.1 + 3 + 5 + … + 11 =
  12. 12.Double 19 =
  13. 13.9 × 7 = 6? — what is the missing digit?
  14. 14.566 × 10 =
  15. 15.I thought of a number, added 9 and then doubled it. I got 36. What was my number?
  16. 16.55 × 10 =
  17. 17.12345679 × 18 =
  18. 18.6 × 9 =
  19. 19.29?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.1 + 3 + 5 + … + 49 =
  21. 21.48 × 1000 =
  22. 22.Take 500. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.In 4 years a boy will be 16 years old. How old was he 5 years ago?
  24. 24.9 × 8 =
  25. 25.I thought of a number, multiplied it by 3 and added 2. I got 47. What was my number?
  26. 26.?789 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.551 × ? = 5510
  28. 28.Magic square (every row, column and diagonal has the same total): ? 7 28 | 25 19 13 | 10 31 16. What is the missing number?
  29. 29.198 + 891 =
  30. 30.The 3rd of a month is a Friday. What day is the 17th of the same month? (a) Friday (b) Monday (c) Thursday (d) Saturday
  31. 31.Magic square (every row, column and diagonal has the same total): ? 8 13 | 14 10 6 | 7 12 11. What is the missing number?
  32. 32.42 × 4 =
  33. 33.Take 65 and take away the sum of its digits. What do you get?
  34. 34.Double 14 =
  35. 35.83 × ? = 8300
  36. 36.1 + 2 + 3 + … + 89 =
  37. 37.Magic trick! Think of 16. Double it, add 12, halve it, then take away 16. What number do you get?
  38. 38.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 100 (c) 98 (d) 101
  39. 39.Take 24 and take away the sum of its digits. What do you get?
  40. 40.Odd one out: which number is NOT in the 8 times table? (a) 64 (b) 17 (c) 32 (d) 48

Answer key

  1. 12
  2. 9
  3. 11
  4. 7
  5. 45
  6. 88
  7. 3300
  8. 28
  9. 1089
  10. 72
  11. 36
  12. 38
  13. 3
  14. 5660
  15. 9
  16. 550
  17. 222222222
  18. 54
  19. 7
  20. 625
  21. 48000
  22. 495
  23. 7
  24. 72
  25. 15
  26. 3
  27. 10
  28. 22
  29. 1089
  30. Friday
  31. 9
  32. 168
  33. 54
  34. 28
  35. 100
  36. 4005
  37. 6
  38. 100
  39. 18
  40. 17

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