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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 333 · 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. 1.98 × ? = 9800
  2. 2.43 × 1000 =
  3. 3.The 5th of a month is a Sunday. What day is the 27th of the same month? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  4. 4.6 × 9 =
  5. 5.1234567 × 9 + 8 =
  6. 6.9 × 2 = ?8 — what is the missing digit?
  7. 7.9 × 7 = ?3 — what is the missing digit?
  8. 8.8 × 9 =
  9. 9.1 × 9 =
  10. 10.9 × 5 =
  11. 11.I thought of a number, added 8 and then doubled it. I got 24. What was my number?
  12. 12.Double 99 =
  13. 13.Half of 142 =
  14. 14.I thought of a number, added 7 and then doubled it. I got 30. What was my number?
  15. 15.12 × 4 =
  16. 16.A girl is 9 years old and her brother is 6 years older. How old will her brother be in 2 years?
  17. 17.Magic square (every row, column and diagonal has the same total): 3 8 ? | 10 6 2 | 5 4 9. What is the missing number?
  18. 18.If today is Saturday, what day was it 27 days ago? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  19. 19.9 × 8 =
  20. 20.17 × 100 =
  21. 21.The ages of two twins add up to 28. How old is each twin?
  22. 22.17 × 4 =
  23. 23.45 × 1000 =
  24. 24.61?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.9 × 7 = 6? — what is the missing digit?
  26. 26.72?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Double 41 =
  28. 28.6 × 4 =
  29. 29.1 + 2 + 3 + … + 11 =
  30. 30.I thought of a number, multiplied it by 5 and added 9. I got 69. What was my number?
  31. 31.If today is Friday, what day was it 46 days ago? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  32. 32.9 × 9 = 8? — what is the missing digit?
  33. 33.1 + 2 + 3 + … + 33 =
  34. 34.396 + 693 =
  35. 35.37 × 24 =
  36. 36.2 × 9 =
  37. 37.Double 57 =
  38. 38.Magic trick! Think of 20. Double it, add 12, halve it, then take away 20. What number do you get?
  39. 39.In 4 years a boy will be 17 years old. How old was he 3 years ago?
  40. 40.42 × 100 =

Answer key

  1. 100
  2. 43000
  3. Monday
  4. 54
  5. 11111111
  6. 1
  7. 6
  8. 72
  9. 9
  10. 45
  11. 4
  12. 198
  13. 71
  14. 8
  15. 48
  16. 17
  17. 7
  18. Sunday
  19. 72
  20. 1700
  21. 14
  22. 68
  23. 45000
  24. 8
  25. 3
  26. 5
  27. 82
  28. 24
  29. 66
  30. 12
  31. Monday
  32. 1
  33. 561
  34. 1089
  35. 888
  36. 18
  37. 114
  38. 6
  39. 10
  40. 4200

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