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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 418 · 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. 1.1234567 × 9 + 8 =
  2. 2.What comes next? 12, 15, 18, 21, ? (a) 24 (b) 25 (c) 27 (d) 21
  3. 3.1 + 2 + 3 + … + 66 =
  4. 4.9 × 5 = 4? — what is the missing digit?
  5. 5.60 × ? = 6000
  6. 6.1 + 2 + 3 + … + 46 =
  7. 7.9 × 3 = ?7 — what is the missing digit?
  8. 8.?566 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Magic square (every row, column and diagonal has the same total): 15 ? 21 | 30 24 18 | 27 12 33. What is the missing number?
  10. 10.9 × 4 = 3? — what is the missing digit?
  11. 11.The 2nd of a month is a Tuesday. What day is the 14th of the same month? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  12. 12.23 × 4 =
  13. 13.37 × 12 =
  14. 14.A father is 44 years old and his son is 4. How old was the father when the son was born?
  15. 15.If today is Wednesday, what day will it be after 91 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  16. 16.1111 × 1111 =
  17. 17.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Double 13 =
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.38 × 4 =
  22. 22.1 + 2 + 3 + … + 40 =
  23. 23.1 × 9 =
  24. 24.60 × 4 =
  25. 25.69? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 62 (c) 66 (d) 65
  27. 27.7 × 4 =
  28. 28.1 + 2 + 3 + … + 78 =
  29. 29.12345679 × 45 =
  30. 30.If today is Wednesday, what day was it 40 days ago? (a) Monday (b) Thursday (c) Friday (d) Saturday
  31. 31.18 × 4 =
  32. 32.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 81 (d) 60
  33. 33.12345679 × 72 =
  34. 34.Double 82 =
  35. 35.Double 24 =
  36. 36.549 × 10 =
  37. 37.1 + 2 + 3 + … + 47 =
  38. 38.Magic square (every row, column and diagonal has the same total): 13 34 ? | 28 22 16 | 25 10 31. What is the missing number?
  39. 39.9 × 10 =
  40. 40.517 × 10 =

Answer key

  1. 11111111
  2. 24
  3. 2211
  4. 5
  5. 100
  6. 1081
  7. 2
  8. 1
  9. 36
  10. 6
  11. Sunday
  12. 92
  13. 444
  14. 40
  15. Wednesday
  16. 1234321
  17. 891
  18. 26
  19. 3
  20. 1
  21. 152
  22. 820
  23. 9
  24. 240
  25. 3
  26. 64
  27. 28
  28. 3081
  29. 555555555
  30. Friday
  31. 72
  32. 80
  33. 888888888
  34. 164
  35. 48
  36. 5490
  37. 1128
  38. 19
  39. 90
  40. 5170

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