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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 816 · 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? 1, 5, 9, 13, ? (a) 21 (b) 18 (c) 13 (d) 17
  2. 2.?906 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.If today is Sunday, what day was it 58 days ago? (a) Thursday (b) Monday (c) Saturday (d) Friday
  4. 4.Half of 78 =
  5. 5.562? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.8 × 9 =
  7. 7.31 × 4 =
  8. 8.What comes next? 4, 12, 20, 28, ? (a) 44 (b) 37 (c) 36 (d) 28
  9. 9.3 × 9 =
  10. 10.826 × 10 =
  11. 11.9 × 3 = 2? — what is the missing digit?
  12. 12.123 × 9 + 4 =
  13. 13.58 × 100 =
  14. 14.Think of 7. Multiply it by 4, then add 2. What number do you end with?
  15. 15.76 × 10 =
  16. 16.What comes next? 7, 11, 15, 19, ? (a) 19 (b) 27 (c) 23 (d) 24
  17. 17.Magic square (every row, column and diagonal has the same total): 7 22 19 | ? 16 4 | 13 10 25. What is the missing number?
  18. 18.37 × 9 =
  19. 19.9 × 4 = ?6 — what is the missing digit?
  20. 20.9 × 7 = ?3 — what is the missing digit?
  21. 21.9 × 10 = 9? — what is the missing digit?
  22. 22.12?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.9 × 4 = 3? — what is the missing digit?
  24. 24.Double 69 =
  25. 25.154 × 10 =
  26. 26.55 × 4 =
  27. 27.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 9 years?
  28. 28.9 × 6 =
  29. 29.906 × ? = 9060
  30. 30.Double 23 =
  31. 31.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
  32. 32.46 × ? = 46000
  33. 33.Do the 1089 trick with 527: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.36 × 100 =
  35. 35.1 + 2 + 3 + … + 85 =
  36. 36.514 × 10 =
  37. 37.If today is Friday, what day will it be after 76 days? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  38. 38.38 × 4 =
  39. 39.1 + 2 + 3 + … + 48 =
  40. 40.1 + 2 + 3 + … + 33 =

Answer key

  1. 17
  2. 3
  3. Friday
  4. 39
  5. 5
  6. 72
  7. 124
  8. 36
  9. 27
  10. 8260
  11. 7
  12. 1111
  13. 5800
  14. 30
  15. 760
  16. 23
  17. 28
  18. 333
  19. 3
  20. 6
  21. 0
  22. 6
  23. 6
  24. 138
  25. 1540
  26. 220
  27. 18
  28. 54
  29. 10
  30. 46
  31. 4
  32. 1000
  33. 1089
  34. 3600
  35. 3655
  36. 5140
  37. Thursday
  38. 152
  39. 1176
  40. 561

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