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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 885 · 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 × 3 =
  2. 2.What comes next? 17, 25, 33, 41, ? (a) 50 (b) 57 (c) 41 (d) 49
  3. 3.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 82 (c) 79 (d) 83
  4. 4.12345679 × 27 =
  5. 5.404 × ? = 4040
  6. 6.12345679 × 18 =
  7. 7.Do the 1089 trick with 711: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.9 × 8 = 7? — what is the missing digit?
  9. 9.9 × 7 =
  10. 10.Half of 82 =
  11. 11.The 5th of a month is a Monday. What day is the 18th of the same month? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  12. 12.41 × 4 =
  13. 13.1 + 2 + 3 + … + 81 =
  14. 14.Magic square (every row, column and diagonal has the same total): 17 ? 25 | 27 19 11 | 13 23 21. What is the missing number?
  15. 15.11 × 11 =
  16. 16.1 + 2 + 3 + … + 16 =
  17. 17.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 101 (c) 98 (d) 100
  18. 18.546 × 10 =
  19. 19.37 × 3 =
  20. 20.Magic square (every row, column and diagonal has the same total): 21 ? 17 | 11 15 19 | 13 23 9. What is the missing number?
  21. 21.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.Magic square (every row, column and diagonal has the same total): ? 23 9 | 11 15 19 | 21 7 17. What is the missing number?
  23. 23.9 × 9 =
  24. 24.Magic square (every row, column and diagonal has the same total): 16 9 14 | ? 13 15 | 12 17 10. What is the missing number?
  25. 25.1 + 3 + 5 + … + 11 =
  26. 26.I thought of a number, multiplied it by 2 and added 8. I got 18. What was my number?
  27. 27.9 × 5 = ?5 — what is the missing digit?
  28. 28.122 × ? = 1220
  29. 29.111 × 111 =
  30. 30.71?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.I thought of a number, added 1 and then doubled it. I got 36. What was my number?
  32. 32.4?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.If today is Thursday, what day will it be after 30 days? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
  34. 34.If today is Wednesday, what day was it 38 days ago? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  35. 35.38 × 100 =
  36. 36.Magic square (every row, column and diagonal has the same total): 4 18 8 | 14 10 6 | 12 ? 16. What is the missing number?
  37. 37.766 × 10 =
  38. 38.Half of 56 =
  39. 39.?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 9 years?

Answer key

  1. 27
  2. 49
  3. 81
  4. 333333333
  5. 10
  6. 222222222
  7. 1089
  8. 2
  9. 63
  10. 41
  11. Sunday
  12. 164
  13. 3321
  14. 15
  15. 121
  16. 136
  17. 100
  18. 5460
  19. 111
  20. 7
  21. 1089
  22. 13
  23. 81
  24. 11
  25. 36
  26. 5
  27. 4
  28. 10
  29. 12321
  30. 8
  31. 17
  32. 7
  33. Saturday
  34. Sunday
  35. 3800
  36. 2
  37. 7660
  38. 28
  39. 9
  40. 21

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