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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 927 · 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.Take 633. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.I thought of a number, multiplied it by 2 and added 3. I got 33. What was my number?
  3. 3.9 × 7 = ?3 — what is the missing digit?
  4. 4.1 + 2 + 3 + … + 96 =
  5. 5.Half of 122 =
  6. 6.9 × 1 =
  7. 7.9 × 9 = ?1 — what is the missing digit?
  8. 8.2 × 9 =
  9. 9.Half of 26 =
  10. 10.812 × 10 =
  11. 11.6 × 4 =
  12. 12.4 × 9 =
  13. 13.5 × 9 =
  14. 14.A father is 39 years old and his son is 14. How old was the father when the son was born?
  15. 15.1 + 3 + 5 + … + 17 =
  16. 16.If today is Friday, what day will it be after 64 days? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  17. 17.9 × 10 = ?0 — what is the missing digit?
  18. 18.13?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 58 and take away the sum of its digits. What do you get?
  20. 20.?866 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 6 years?
  22. 22.164 × 10 =
  23. 23.9 × 8 =
  24. 24.43 × 4 =
  25. 25.95 × 100 =
  26. 26.If today is Sunday, what day was it 31 days ago? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  27. 27.2?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 229. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Take 91 and take away the sum of its digits. What do you get?
  30. 30.9 × 7 = 6? — what is the missing digit?
  31. 31.Half of 142 =
  32. 32.Take 25 and take away the sum of its digits. What do you get?
  33. 33.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 33 (d) 32
  34. 34.12345679 × 72 =
  35. 35.9 × 6 =
  36. 36.52 × 4 =
  37. 37.Magic square (every row, column and diagonal has the same total): 7 17 15 | 21 13 5 | ? 9 19. What is the missing number?
  38. 38.9 × 5 =
  39. 39.28 × 1000 =
  40. 40.Take 913. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 297
  2. 15
  3. 6
  4. 4656
  5. 61
  6. 9
  7. 8
  8. 18
  9. 13
  10. 8120
  11. 24
  12. 36
  13. 45
  14. 25
  15. 81
  16. Saturday
  17. 9
  18. 7
  19. 45
  20. 7
  21. 15
  22. 1640
  23. 72
  24. 172
  25. 9500
  26. Thursday
  27. 1
  28. 693
  29. 81
  30. 3
  31. 71
  32. 18
  33. 32
  34. 888888888
  35. 54
  36. 208
  37. 11
  38. 45
  39. 28000
  40. 594

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