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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 403 · 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. 1.6 × ? = 6000
  2. 2.9 × 5 = 4? — what is the missing digit?
  3. 3.87 × 100 =
  4. 4.791 × ? = 7910
  5. 5.23 × 4 =
  6. 6.37 × 4 =
  7. 7.9 × 7 =
  8. 8.12345678 × 8 + 8 =
  9. 9.1 + 2 + 3 + … + 43 =
  10. 10.Half of 102 =
  11. 11.I thought of a number, added 6 and then doubled it. I got 34. What was my number?
  12. 12.Double 19 =
  13. 13.943 × 10 =
  14. 14.Double 11 =
  15. 15.12 × ? = 1200
  16. 16.12345679 × 9 =
  17. 17.4 × 9 =
  18. 18.9 × 3 = ?7 — what is the missing digit?
  19. 19.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 7 years?
  20. 20.9 × 1 =
  21. 21.9 × 9 =
  22. 22.3 × 9 =
  23. 23.48 × 4 =
  24. 24.The 1st of a month is a Saturday. What day is the 12th of the same month? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  25. 25.If today is Monday, what day will it be after 9 days? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
  26. 26.17 × 100 =
  27. 27.What comes next? 9, 14, 19, 24, ? (a) 24 (b) 29 (c) 34 (d) 30
  28. 28.If today is Thursday, what day will it be after 94 days? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  29. 29.59 × ? = 590
  30. 30.37 × 9 =
  31. 31.28 × 4 =
  32. 32.1 + 3 + 5 + … + 33 =
  33. 33.8?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.1 + 2 + 3 + … + 30 =
  35. 35.The 1st of a month is a Saturday. What day is the 29th of the same month? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  36. 36.In 2 years a boy will be 16 years old. How old was he 4 years ago?
  37. 37.Magic square (every row, column and diagonal has the same total): 25 10 31 | 28 ? 16 | 13 34 19. What is the missing number?
  38. 38.Do the 1089 trick with 228: reverse and subtract, then reverse that answer and add. What do you get?
  39. 39.1 + 2 + 3 + … + 33 =
  40. 40.12 × 8 + 2 =

Answer key

  1. 1000
  2. 5
  3. 8700
  4. 10
  5. 92
  6. 148
  7. 63
  8. 98765432
  9. 946
  10. 51
  11. 11
  12. 38
  13. 9430
  14. 22
  15. 100
  16. 111111111
  17. 36
  18. 2
  19. 18
  20. 9
  21. 81
  22. 27
  23. 192
  24. Wednesday
  25. Wednesday
  26. 1700
  27. 29
  28. Sunday
  29. 10
  30. 333
  31. 112
  32. 289
  33. 8
  34. 465
  35. Saturday
  36. 10
  37. 22
  38. 1089
  39. 561
  40. 98

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