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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 190 · 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.In 4 years a boy will be 16 years old. How old was he 5 years ago?
  2. 2.1 + 2 + 3 + … + 22 =
  3. 3.6 × 9 =
  4. 4.What comes next? 9, 13, 17, 21, ? (a) 26 (b) 29 (c) 21 (d) 25
  5. 5.9 × 4 =
  6. 6.1?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.47 × 4 =
  8. 8.Double 71 =
  9. 9.1 + 3 + 5 + … + 39 =
  10. 10.15 × 4 =
  11. 11.9 × 6 =
  12. 12.46 × 1000 =
  13. 13.1 + 3 + 5 + … + 33 =
  14. 14.If today is Tuesday, what day was it 30 days ago? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  15. 15.Magic trick! Think of 10. Double it, add 16, halve it, then take away 10. What number do you get?
  16. 16.11 × 4 =
  17. 17.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
  18. 18.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 83 (c) 81 (d) 79
  19. 19.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
  20. 20.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 38 (c) 37 (d) 36
  21. 21.Take 169. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.9 × 9 = ?1 — what is the missing digit?
  23. 23.If today is Wednesday, what day was it 23 days ago? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  24. 24.29 × 4 =
  25. 25.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 27 (c) 26 (d) 25
  26. 26.What comes next? 15, 18, 21, 24, ? (a) 24 (b) 28 (c) 27 (d) 30
  27. 27.9 × 6 = 5? — what is the missing digit?
  28. 28.297 + 792 =
  29. 29.1 × 9 =
  30. 30.Half of 12 =
  31. 31.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 11 | 12 5 ?. What is the missing number?
  32. 32.1 + 2 + 3 + … + 55 =
  33. 33.What comes next? 3, 8, 13, 18, ? (a) 28 (b) 24 (c) 18 (d) 23
  34. 34.Magic square (every row, column and diagonal has the same total): 11 4 9 | 6 8 10 | ? 12 5. What is the missing number?
  35. 35.1 + 2 + 3 + … + 6 =
  36. 36.Do the 1089 trick with 691: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.Magic square (every row, column and diagonal has the same total): 13 10 25 | 28 16 4 | 7 22 ?. What is the missing number?
  38. 38.If today is Sunday, what day will it be after 46 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  39. 39.9 × 2 = ?8 — what is the missing digit?
  40. 40.9 × 5 = 4? — what is the missing digit?

Answer key

  1. 7
  2. 253
  3. 54
  4. 25
  5. 36
  6. 8
  7. 188
  8. 142
  9. 400
  10. 60
  11. 54
  12. 46000
  13. 289
  14. Sunday
  15. 8
  16. 44
  17. 16
  18. 81
  19. 3
  20. 36
  21. 792
  22. 8
  23. Monday
  24. 116
  25. 25
  26. 27
  27. 4
  28. 1089
  29. 9
  30. 6
  31. 10
  32. 1540
  33. 23
  34. 7
  35. 21
  36. 1089
  37. 19
  38. Thursday
  39. 1
  40. 5

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