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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 409 · 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): 14 15 10 | ? 13 17 | 16 11 12. What is the missing number?
  2. 2.45 × 1000 =
  3. 3.I thought of a number, added 7 and then doubled it. I got 34. What was my number?
  4. 4.Take 698. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.37 × 27 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.12345679 × 81 =
  8. 8.825 × 10 =
  9. 9.1 + 3 + 5 + … + 43 =
  10. 10.4?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.A father is 44 years old and his son is 8. How old was the father when the son was born?
  12. 12.Think of 7. Multiply it by 3, then add 1. What number do you end with?
  13. 13.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.?470 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.What comes next? 9, 18, 27, 36, ? (a) 45 (b) 54 (c) 46 (d) 36
  16. 16.1 + 3 + 5 + … + 33 =
  17. 17.Half of 62 =
  18. 18.1 + 2 + 3 + … + 15 =
  19. 19.1 + 2 + 3 + … + 12 =
  20. 20.1 + 3 + 5 + … + 41 =
  21. 21.11111 × 11111 =
  22. 22.Half of 164 =
  23. 23.1 + 2 + 3 + … + 29 =
  24. 24.9 × 6 =
  25. 25.11 × 1000 =
  26. 26.9 × 4 =
  27. 27.70?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.1 × 9 =
  29. 29.9 × 2 =
  30. 30.Magic square (every row, column and diagonal has the same total): ? 9 2 | 3 5 7 | 8 1 6. What is the missing number?
  31. 31.In 2 years a boy will be 13 years old. How old was he 4 years ago?
  32. 32.56 × 4 =
  33. 33.12 × 9 + 3 =
  34. 34.Magic square (every row, column and diagonal has the same total): ? 13 8 | 11 9 7 | 10 5 12. What is the missing number?
  35. 35.I thought of a number, added 7 and then doubled it. I got 20. What was my number?
  36. 36.123 × 8 + 3 =
  37. 37.A father is 44 years old and his son is 12. How old was the father when the son was born?
  38. 38.Double 81 =
  39. 39.111111 × 111111 =
  40. 40.I thought of a number, added 7 and then doubled it. I got 42. What was my number?

Answer key

  1. 9
  2. 45000
  3. 10
  4. 198
  5. 999
  6. 7
  7. 999999999
  8. 8250
  9. 484
  10. 6
  11. 36
  12. 22
  13. 891
  14. 7
  15. 45
  16. 289
  17. 31
  18. 120
  19. 78
  20. 441
  21. 123454321
  22. 82
  23. 435
  24. 54
  25. 11000
  26. 36
  27. 7
  28. 9
  29. 18
  30. 4
  31. 7
  32. 224
  33. 111
  34. 6
  35. 3
  36. 987
  37. 32
  38. 162
  39. 12345654321
  40. 14

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