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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 761 · 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.Half of 72 =
  2. 2.The 9th of a month is a Friday. What day is the 17th of the same month? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  3. 3.8 × 9 =
  4. 4.12 × 9 + 3 =
  5. 5.Half of 138 =
  6. 6.Half of 56 =
  7. 7.Magic trick! Think of 19. Double it, add 12, halve it, then take away 19. What number do you get?
  8. 8.999 × ? = 9990
  9. 9.8?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.1 + 3 + 5 + … + 35 =
  11. 11.What comes next? 9, 15, 21, 27, ? (a) 27 (b) 33 (c) 34 (d) 39
  12. 12.9 × 6 = 5? — what is the missing digit?
  13. 13.23 × 4 =
  14. 14.4 × 9 =
  15. 15.1 + 2 + 3 + … + 25 =
  16. 16.65 × 10 =
  17. 17.Magic square (every row, column and diagonal has the same total): 20 35 14 | 17 23 29 | 32 ? 26. What is the missing number?
  18. 18.9 × 8 = ?2 — what is the missing digit?
  19. 19.If today is Monday, what day will it be after 43 days? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
  20. 20.A father is 44 years old and his son is 9. How old was the father when the son was born?
  21. 21.8?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 7 = ?3 — what is the missing digit?
  23. 23.1 + 2 + 3 + … + 78 =
  24. 24.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 8 years?
  25. 25.Magic trick! Think of 5. Double it, add 10, halve it, then take away 5. What number do you get?
  26. 26.9 × 10 = 9? — what is the missing digit?
  27. 27.Half of 172 =
  28. 28.Take 661. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.24 × 4 =
  30. 30.The 4th of a month is a Monday. What day is the 22nd of the same month? (a) Monday (b) Saturday (c) Friday (d) Thursday
  31. 31.What comes next? 4, 7, 10, 13, ? (a) 19 (b) 13 (c) 16 (d) 17
  32. 32.1 + 3 + 5 + … + 19 =
  33. 33.9 × 9 =
  34. 34.Half of 98 =
  35. 35.In 3 years a boy will be 16 years old. How old was he 5 years ago?
  36. 36.15 × 10 =
  37. 37.9 × 10 =
  38. 38.1 + 2 + 3 + … + 27 =
  39. 39.The 3rd of a month is a Tuesday. What day is the 30th of the same month? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  40. 40.1234567 × 9 + 8 =

Answer key

  1. 36
  2. Saturday
  3. 72
  4. 111
  5. 69
  6. 28
  7. 6
  8. 10
  9. 4
  10. 324
  11. 33
  12. 4
  13. 92
  14. 36
  15. 325
  16. 650
  17. 11
  18. 7
  19. Tuesday
  20. 35
  21. 5
  22. 6
  23. 3081
  24. 22
  25. 5
  26. 0
  27. 86
  28. 495
  29. 96
  30. Friday
  31. 16
  32. 100
  33. 81
  34. 49
  35. 8
  36. 150
  37. 90
  38. 378
  39. Monday
  40. 11111111

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