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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 828 · 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.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 5 years?
  2. 2.56 × 4 =
  3. 3.82 × 100 =
  4. 4.What comes next? 5, 13, 21, 29, ? (a) 37 (b) 29 (c) 45 (d) 38
  5. 5.10 × 9 =
  6. 6.If today is Saturday, what day was it 31 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  7. 7.1 × 9 =
  8. 8.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 65 (c) 56 (d) 48
  9. 9.Half of 16 =
  10. 10.12 × 8 + 2 =
  11. 11.9 × 8 = ?2 — what is the missing digit?
  12. 12.31 × 4 =
  13. 13.91 × 100 =
  14. 14.The 5th of a month is a Saturday. What day is the 20th of the same month? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  15. 15.Magic square (every row, column and diagonal has the same total): 6 16 ? | 20 12 4 | 10 8 18. What is the missing number?
  16. 16.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 ? 20 | 14 24 10. What is the missing number?
  17. 17.Magic square (every row, column and diagonal has the same total): 29 8 23 | 14 20 26 | 17 32 ?. What is the missing number?
  18. 18.Magic square (every row, column and diagonal has the same total): 28 13 16 | 7 19 31 | 22 ? 10. What is the missing number?
  19. 19.The 4th of a month is a Thursday. What day is the 23rd of the same month? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  20. 20.9 × 10 = 9? — what is the missing digit?
  21. 21.If today is Friday, what day was it 33 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  22. 22.2 × 9 =
  23. 23.5 × 9 =
  24. 24.1 + 3 + 5 + … + 11 =
  25. 25.What comes next? 7, 14, 21, 28, ? (a) 42 (b) 35 (c) 28 (d) 36
  26. 26.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.314? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Half of 88 =
  29. 29.9 × 2 = 1? — what is the missing digit?
  30. 30.1 + 2 + 3 + … + 14 =
  31. 31.12345679 × 81 =
  32. 32.?001 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Half of 112 =
  34. 34.1 + 2 + 3 + … + 60 =
  35. 35.3 × 9 =
  36. 36.14 × 4 =
  37. 37.9 × 3 = 2? — what is the missing digit?
  38. 38.6 × 9 =
  39. 39.If today is Tuesday, what day will it be after 57 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  40. 40.9 × 6 = 5? — what is the missing digit?

Answer key

  1. 20
  2. 224
  3. 8200
  4. 37
  5. 90
  6. Wednesday
  7. 9
  8. 64
  9. 8
  10. 98
  11. 7
  12. 124
  13. 9100
  14. Sunday
  15. 14
  16. 16
  17. 11
  18. 25
  19. Tuesday
  20. 0
  21. Sunday
  22. 18
  23. 45
  24. 36
  25. 35
  26. 594
  27. 1
  28. 44
  29. 8
  30. 105
  31. 999999999
  32. 8
  33. 56
  34. 1830
  35. 27
  36. 56
  37. 7
  38. 54
  39. Wednesday
  40. 4

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