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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 270 · 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. 1.9 × 4 = 3? — what is the missing digit?
  2. 2.What comes next? 14, 21, 28, 35, ? (a) 43 (b) 49 (c) 42 (d) 35
  3. 3.Take 95 and take away the sum of its digits. What do you get?
  4. 4.48 × 4 =
  5. 5.1 + 3 + 5 + … + 9 =
  6. 6.45 × 4 =
  7. 7.What comes next? 16, 18, 20, 22, ? (a) 24 (b) 22 (c) 25 (d) 26
  8. 8.A father is 38 years old and his son is 4. How old was the father when the son was born?
  9. 9.1 × 9 =
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 26 (d) 23
  12. 12.If today is Saturday, what day was it 56 days ago? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
  13. 13.9 × 8 =
  14. 14.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 8 years?
  15. 15.I thought of a number, added 8 and then doubled it. I got 38. What was my number?
  16. 16.9 × 9 =
  17. 17.Double 96 =
  18. 18.77 × 100 =
  19. 19.49 × 4 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 23 9 | 11 15 19 | 21 7 17. What is the missing number?
  21. 21.12345679 × 27 =
  22. 22.The 6th of a month is a Monday. What day is the 24th of the same month? (a) Thursday (b) Friday (c) Saturday (d) Monday
  23. 23.1 + 3 + 5 + … + 13 =
  24. 24.Double 92 =
  25. 25.A father is 38 years old and his son is 10. How old was the father when the son was born?
  26. 26.12345679 × 9 =
  27. 27.24?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.27 × 4 =
  29. 29.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
  30. 30.A girl is 9 years old and her brother is 4 years older. How old will her brother be in 7 years?
  31. 31.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 24 (d) 32
  32. 32.If today is Wednesday, what day will it be after 99 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  33. 33.12 × 9 + 3 =
  34. 34.1 + 2 + 3 + … + 36 =
  35. 35.Double 26 =
  36. 36.9 × 3 = ?7 — what is the missing digit?
  37. 37.4 × 9 =
  38. 38.Double 16 =
  39. 39.9 × 8 = 7? — what is the missing digit?
  40. 40.?962 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 6
  2. 42
  3. 81
  4. 192
  5. 25
  6. 180
  7. 24
  8. 34
  9. 9
  10. 3
  11. 25
  12. Saturday
  13. 72
  14. 19
  15. 11
  16. 81
  17. 192
  18. 7700
  19. 196
  20. 13
  21. 333333333
  22. Friday
  23. 49
  24. 184
  25. 28
  26. 111111111
  27. 2
  28. 108
  29. 80
  30. 20
  31. 32
  32. Thursday
  33. 111
  34. 666
  35. 52
  36. 2
  37. 36
  38. 32
  39. 2
  40. 1

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