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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 804 · 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. 1.7 × 9 =
  2. 2.1 + 2 + 3 + … + 23 =
  3. 3.9 × 8 = 7? — what is the missing digit?
  4. 4.1 + 2 + 3 + … + 47 =
  5. 5.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.48 × 10 =
  7. 7.I thought of a number, added 3 and then doubled it. I got 30. What was my number?
  8. 8.The 8th of a month is a Thursday. What day is the 26th of the same month? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  9. 9.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 11 | 8 ? 4. What is the missing number?
  10. 10.If today is Sunday, what day was it 18 days ago? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  11. 11.Double 34 =
  12. 12.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
  13. 13.12345679 × 45 =
  14. 14.9 × 7 = ?3 — what is the missing digit?
  15. 15.The 4th of a month is a Tuesday. What day is the 24th of the same month? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  16. 16.9 × 10 = ?0 — what is the missing digit?
  17. 17.In 4 years a boy will be 13 years old. How old was he 5 years ago?
  18. 18.Odd one out: which number is NOT in the 6 times table? (a) 18 (b) 30 (c) 36 (d) 52
  19. 19.Double 17 =
  20. 20.396 × ? = 3960
  21. 21.9 × 7 = 6? — what is the missing digit?
  22. 22.9 × 2 =
  23. 23.37 × 100 =
  24. 24.If today is Tuesday, what day will it be after 77 days? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  25. 25.60 × 4 =
  26. 26.9 × 4 = ?6 — what is the missing digit?
  27. 27.37 × 3 =
  28. 28.Magic square (every row, column and diagonal has the same total): 12 14 4 | ? 10 18 | 16 6 8. What is the missing number?
  29. 29.495 + 594 =
  30. 30.The 7th of a month is a Sunday. What day is the 18th of the same month? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  31. 31.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 3 years?
  32. 32.If today is Wednesday, what day was it 44 days ago? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
  33. 33.What comes next? 15, 24, 33, 42, ? (a) 60 (b) 51 (c) 52 (d) 42
  34. 34.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 ? 20 | 14 24 10. What is the missing number?
  35. 35.204 × 10 =
  36. 36.If today is Sunday, what day was it 35 days ago? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  37. 37.If today is Monday, what day will it be after 36 days? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
  38. 38.1 + 2 + 3 + … + 33 =
  39. 39.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17
  40. 40.10 × 9 =

Answer key

  1. 63
  2. 276
  3. 2
  4. 1128
  5. 1089
  6. 480
  7. 12
  8. Monday
  9. 9
  10. Wednesday
  11. 68
  12. 5
  13. 555555555
  14. 6
  15. Monday
  16. 9
  17. 4
  18. 52
  19. 34
  20. 10
  21. 3
  22. 18
  23. 3700
  24. Tuesday
  25. 240
  26. 3
  27. 111
  28. 2
  29. 1089
  30. Thursday
  31. 11
  32. Monday
  33. 51
  34. 16
  35. 2040
  36. Sunday
  37. Tuesday
  38. 561
  39. 16
  40. 90

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