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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 811 · 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. 1.4 × 1000 =
  2. 2.9 × 8 = ?2 — what is the missing digit?
  3. 3.9 × 9 =
  4. 4.Magic square (every row, column and diagonal has the same total): 9 ? 5 | 4 8 12 | 11 6 7. What is the missing number?
  5. 5.9 × 5 = 4? — what is the missing digit?
  6. 6.Magic square (every row, column and diagonal has the same total): 9 23 ? | 19 15 11 | 17 7 21. What is the missing number?
  7. 7.I thought of a number, multiplied it by 5 and added 8. I got 33. What was my number?
  8. 8.40 × 4 =
  9. 9.Half of 172 =
  10. 10.The 6th of a month is a Monday. What day is the 25th of the same month? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  11. 11.1 + 3 + 5 + … + 33 =
  12. 12.9 × 7 = ?3 — what is the missing digit?
  13. 13.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  14. 14.Double 41 =
  15. 15.7 × 100 =
  16. 16.Take 853. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.I thought of a number, multiplied it by 2 and added 2. I got 10. What was my number?
  18. 18.1 × 9 =
  19. 19.584 × 10 =
  20. 20.1 + 3 + 5 + … + 29 =
  21. 21.Double 27 =
  22. 22.9 × 9 = 8? — what is the missing digit?
  23. 23.1 + 2 + 3 + … + 74 =
  24. 24.If today is Sunday, what day was it 12 days ago? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  25. 25.1 + 2 + 3 + … + 62 =
  26. 26.A father is 31 years old and his son is 10. How old was the father when the son was born?
  27. 27.19 × 4 =
  28. 28.?327 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.5 × 9 =
  31. 31.1234567 × 9 + 8 =
  32. 32.Take 614. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.12345679 × 63 =
  34. 34.The 6th of a month is a Monday. What day is the 28th of the same month? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
  35. 35.81 × 100 =
  36. 36.Half of 86 =
  37. 37.Double 17 =
  38. 38.9 × 3 = ?7 — what is the missing digit?
  39. 39.I thought of a number, multiplied it by 3 and added 4. I got 10. What was my number?
  40. 40.1 + 2 + 3 + … + 29 =

Answer key

  1. 4000
  2. 7
  3. 81
  4. 10
  5. 5
  6. 13
  7. 5
  8. 160
  9. 86
  10. Saturday
  11. 289
  12. 6
  13. 8
  14. 82
  15. 700
  16. 495
  17. 4
  18. 9
  19. 5840
  20. 225
  21. 54
  22. 1
  23. 2775
  24. Tuesday
  25. 1953
  26. 21
  27. 76
  28. 6
  29. 6
  30. 45
  31. 11111111
  32. 198
  33. 777777777
  34. Tuesday
  35. 8100
  36. 43
  37. 34
  38. 2
  39. 2
  40. 435

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