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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 404 · 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.Double 75 =
  2. 2.1 + 2 + 3 + … + 40 =
  3. 3.9 × 9 = ?1 — what is the missing digit?
  4. 4.97 × 100 =
  5. 5.31 × 100 =
  6. 6.Take 67 and take away the sum of its digits. What do you get?
  7. 7.10 × 9 =
  8. 8.Half of 164 =
  9. 9.7 × 9 =
  10. 10.43 × 4 =
  11. 11.If today is Wednesday, what day will it be after 66 days? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  12. 12.The 3rd of a month is a Sunday. What day is the 13th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  13. 13.9 × 7 = 6? — what is the missing digit?
  14. 14.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 3 years?
  15. 15.If today is Wednesday, what day will it be after 38 days? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  16. 16.In 2 years a boy will be 11 years old. How old was he 3 years ago?
  17. 17.In 2 years a boy will be 15 years old. How old was he 4 years ago?
  18. 18.Magic square (every row, column and diagonal has the same total): 9 19 5 | ? 11 15 | 17 3 13. What is the missing number?
  19. 19.24?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.12345678 × 9 + 9 =
  21. 21.9 × 9 = 8? — what is the missing digit?
  22. 22.I thought of a number, multiplied it by 2 and added 1. I got 25. What was my number?
  23. 23.Double 41 =
  24. 24.Take 113. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.1 + 3 + 5 + … + 47 =
  26. 26.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 4 years?
  27. 27.Half of 176 =
  28. 28.Half of 24 =
  29. 29.9 × 6 = 5? — what is the missing digit?
  30. 30.12345 × 9 + 6 =
  31. 31.31 × 4 =
  32. 32.9 × 7 =
  33. 33.37 × 12 =
  34. 34.If today is Saturday, what day will it be after 90 days? (a) Saturday (b) Friday (c) Thursday (d) Monday
  35. 35.9 × 9 =
  36. 36.173? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.24 × 1000 =
  38. 38.?857 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.If today is Wednesday, what day will it be after 53 days? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  40. 40.123456789 × 8 + 9 =

Answer key

  1. 150
  2. 820
  3. 8
  4. 9700
  5. 3100
  6. 54
  7. 90
  8. 82
  9. 63
  10. 172
  11. Saturday
  12. Wednesday
  13. 3
  14. 10
  15. Saturday
  16. 6
  17. 9
  18. 7
  19. 2
  20. 111111111
  21. 1
  22. 12
  23. 82
  24. 198
  25. 576
  26. 13
  27. 88
  28. 12
  29. 4
  30. 111111
  31. 124
  32. 63
  33. 444
  34. Friday
  35. 81
  36. 7
  37. 24000
  38. 7
  39. Sunday
  40. 987654321

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