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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 607 · 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.Magic trick! Think of 16. Double it, add 16, halve it, then take away 16. What number do you get?
  2. 2.9 × 4 =
  3. 3.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 9 years?
  4. 4.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 81 (d) 83
  5. 5.I thought of a number, added 1 and then doubled it. I got 42. What was my number?
  6. 6.1 + 3 + 5 + … + 15 =
  7. 7.52 × 4 =
  8. 8.20 × 4 =
  9. 9.123 × 8 + 3 =
  10. 10.1 + 3 + 5 + … + 13 =
  11. 11.3 × 9 =
  12. 12.9 × 5 =
  13. 13.9 × 6 = ?4 — what is the missing digit?
  14. 14.Magic square (every row, column and diagonal has the same total): 13 28 ? | 34 22 10 | 19 16 31. What is the missing number?
  15. 15.28 × 4 =
  16. 16.If today is Monday, what day was it 58 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  17. 17.In 5 years a boy will be 13 years old. How old was he 2 years ago?
  18. 18.9 × 10 = 9? — what is the missing digit?
  19. 19.1 + 3 + 5 + … + 11 =
  20. 20.9 × 9 = ?1 — what is the missing digit?
  21. 21.Think of 2. Multiply it by 5, then add 8. What number do you end with?
  22. 22.If today is Saturday, what day will it be after 50 days? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  23. 23.I thought of a number, multiplied it by 5 and added 6. I got 66. What was my number?
  24. 24.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
  25. 25.Odd one out: which number is NOT in the 6 times table? (a) 17 (b) 30 (c) 42 (d) 18
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  27. 27.9 × 2 = ?8 — what is the missing digit?
  28. 28.The 6th of a month is a Monday. What day is the 23rd of the same month? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  29. 29.If today is Sunday, what day was it 22 days ago? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  30. 30.Magic square (every row, column and diagonal has the same total): 15 5 19 | 17 13 9 | ? 21 11. What is the missing number?
  31. 31.12 × ? = 12000
  32. 32.36 × ? = 360
  33. 33.38 × 4 =
  34. 34.1 + 2 + 3 + … + 40 =
  35. 35.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 12 (c) 51 (d) 48
  36. 36.4 × 9 =
  37. 37.198 + 891 =
  38. 38.I thought of a number, multiplied it by 2 and added 4. I got 28. What was my number?
  39. 39.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 4 years?
  40. 40.The 7th of a month is a Friday. What day is the 15th of the same month? (a) Friday (b) Tuesday (c) Saturday (d) Sunday

Answer key

  1. 8
  2. 36
  3. 21
  4. 81
  5. 20
  6. 64
  7. 208
  8. 80
  9. 987
  10. 49
  11. 27
  12. 45
  13. 5
  14. 25
  15. 112
  16. Saturday
  17. 6
  18. 0
  19. 36
  20. 8
  21. 18
  22. Sunday
  23. 12
  24. 3
  25. 17
  26. 495
  27. 1
  28. Thursday
  29. Saturday
  30. 7
  31. 1000
  32. 10
  33. 152
  34. 820
  35. 51
  36. 36
  37. 1089
  38. 12
  39. 18
  40. Saturday

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