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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 589 · 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.What comes next? 12, 18, 24, 30, ? (a) 37 (b) 36 (c) 30 (d) 42
  2. 2.12345679 × 27 =
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.96 × 100 =
  5. 5.4 × 9 =
  6. 6.6 × 9 =
  7. 7.2 × ? = 200
  8. 8.8 × 4 =
  9. 9.60 × ? = 600
  10. 10.9 × 4 = 3? — what is the missing digit?
  11. 11.Half of 82 =
  12. 12.In 6 years a boy will be 19 years old. How old was he 6 years ago?
  13. 13.10 × 4 =
  14. 14.The 3rd of a month is a Wednesday. What day is the 17th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  15. 15.If today is Wednesday, what day will it be after 84 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
  16. 16.12345679 × 63 =
  17. 17.Do the 1089 trick with 821: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.What comes next? 5, 11, 17, 23, ? (a) 35 (b) 30 (c) 23 (d) 29
  19. 19.35 × 100 =
  20. 20.A father is 31 years old and his son is 9. How old was the father when the son was born?
  21. 21.?039 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.1 + 2 + 3 + … + 78 =
  23. 23.1 × 9 =
  24. 24.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 60 (d) 81
  25. 25.46 × 4 =
  26. 26.What comes next? 16, 24, 32, 40, ? (a) 56 (b) 48 (c) 40 (d) 49
  27. 27.The ages of two twins add up to 16. How old is each twin?
  28. 28.The ages of two twins add up to 24. How old is each twin?
  29. 29.207? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Magic square (every row, column and diagonal has the same total): 19 4 25 | ? 16 10 | 7 28 13. What is the missing number?
  31. 31.43?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.50 × ? = 50000
  33. 33.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 102 (c) 98 (d) 100
  34. 34.1 + 2 + 3 + … + 16 =
  35. 35.425 × 10 =
  36. 36.1 + 3 + 5 + … + 9 =
  37. 37.11 × 10 =
  38. 38.Take 38 and take away the sum of its digits. What do you get?
  39. 39.If today is Tuesday, what day will it be after 83 days? (a) Sunday (b) Monday (c) Thursday (d) Tuesday
  40. 40.9 × 8 = ?2 — what is the missing digit?

Answer key

  1. 36
  2. 333333333
  3. 4
  4. 9600
  5. 36
  6. 54
  7. 100
  8. 32
  9. 10
  10. 6
  11. 41
  12. 7
  13. 40
  14. Wednesday
  15. Wednesday
  16. 777777777
  17. 1089
  18. 29
  19. 3500
  20. 22
  21. 6
  22. 3081
  23. 9
  24. 80
  25. 184
  26. 48
  27. 8
  28. 12
  29. 9
  30. 22
  31. 5
  32. 1000
  33. 100
  34. 136
  35. 4250
  36. 25
  37. 110
  38. 27
  39. Monday
  40. 7

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