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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 842 · 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.The 2nd of a month is a Saturday. What day is the 19th of the same month? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  2. 2.Half of 96 =
  3. 3.31 × 4 =
  4. 4.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  5. 5.A girl is 9 years old and her brother is 6 years older. How old will her brother be in 9 years?
  6. 6.Half of 166 =
  7. 7.51 × 4 =
  8. 8.9 × 5 = ?5 — what is the missing digit?
  9. 9.1111 × 1111 =
  10. 10.11111 × 11111 =
  11. 11.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 49 (c) 50 (d) 47
  12. 12.I thought of a number, multiplied it by 2 and added 1. I got 13. What was my number?
  13. 13.9 × 2 = ?8 — what is the missing digit?
  14. 14.Think of 4. Multiply it by 4, then add 7. What number do you end with?
  15. 15.704 × ? = 7040
  16. 16.What comes next? 6, 15, 24, 33, ? (a) 33 (b) 51 (c) 42 (d) 43
  17. 17.Double 31 =
  18. 18.9 × 4 = ?6 — what is the missing digit?
  19. 19.9 × 10 =
  20. 20.If today is Wednesday, what day will it be after 54 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  21. 21.If today is Saturday, what day will it be after 26 days? (a) Thursday (b) Sunday (c) Wednesday (d) Friday
  22. 22.9 × 7 =
  23. 23.1 + 3 + 5 + … + 49 =
  24. 24.If today is Saturday, what day will it be after 34 days? (a) Monday (b) Saturday (c) Friday (d) Thursday
  25. 25.32 × 4 =
  26. 26.1 + 3 + 5 + … + 9 =
  27. 27.9 × 9 =
  28. 28.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.9 × 7 = ?3 — what is the missing digit?
  30. 30.In 6 years a boy will be 14 years old. How old was he 2 years ago?
  31. 31.1 × 9 =
  32. 32.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 36 (c) 42 (d) 48
  33. 33.49 × 4 =
  34. 34.19 × 4 =
  35. 35.5 × 9 =
  36. 36.9 × 9 = 8? — what is the missing digit?
  37. 37.37 × 9 =
  38. 38.9 × 10 = ?0 — what is the missing digit?
  39. 39.Double 43 =
  40. 40.9 × 5 = 4? — what is the missing digit?

Answer key

  1. Tuesday
  2. 48
  3. 124
  4. 8
  5. 24
  6. 83
  7. 204
  8. 4
  9. 1234321
  10. 123454321
  11. 49
  12. 6
  13. 1
  14. 23
  15. 10
  16. 42
  17. 62
  18. 3
  19. 90
  20. Monday
  21. Thursday
  22. 63
  23. 625
  24. Friday
  25. 128
  26. 25
  27. 81
  28. 1089
  29. 6
  30. 6
  31. 9
  32. 48
  33. 196
  34. 76
  35. 45
  36. 1
  37. 333
  38. 9
  39. 86
  40. 5

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