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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 671 · 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.Double 53 =
  2. 2.Half of 112 =
  3. 3.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
  4. 4.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 62 (c) 64 (d) 65
  5. 5.792 + 297 =
  6. 6.If today is Tuesday, what day will it be after 27 days? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  7. 7.35?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.3 × 9 =
  9. 9.12345679 × 45 =
  10. 10.I thought of a number, multiplied it by 5 and added 3. I got 63. What was my number?
  11. 11.A father is 36 years old and his son is 9. How old was the father when the son was born?
  12. 12.9 × 7 =
  13. 13.9 × 2 = ?8 — what is the missing digit?
  14. 14.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 7 years?
  15. 15.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
  16. 16.Double 27 =
  17. 17.?527 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.I thought of a number, added 6 and then doubled it. I got 34. What was my number?
  19. 19.775 × 10 =
  20. 20.In 5 years a boy will be 19 years old. How old was he 2 years ago?
  21. 21.660? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.7?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.What comes next? 13, 20, 27, 34, ? (a) 42 (b) 48 (c) 34 (d) 41
  24. 24.111 × 111 =
  25. 25.I thought of a number, added 8 and then doubled it. I got 22. What was my number?
  26. 26.1 + 3 + 5 + … + 21 =
  27. 27.The 6th of a month is a Sunday. What day is the 17th of the same month? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
  28. 28.Magic square (every row, column and diagonal has the same total): 20 6 ? | 10 14 18 | 12 22 8. What is the missing number?
  29. 29.36 × 1000 =
  30. 30.If today is Saturday, what day will it be after 21 days? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  31. 31.Half of 22 =
  32. 32.If today is Thursday, what day will it be after 85 days? (a) Saturday (b) Friday (c) Monday (d) Thursday
  33. 33.Take 139. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Double 36 =
  35. 35.12345679 × 63 =
  36. 36.194? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.I thought of a number, multiplied it by 4 and added 3. I got 19. What was my number?
  38. 38.891 + 198 =
  39. 39.If today is Sunday, what day was it 33 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  40. 40.9 × 9 =

Answer key

  1. 106
  2. 56
  3. 4
  4. 64
  5. 1089
  6. Monday
  7. 1
  8. 27
  9. 555555555
  10. 12
  11. 27
  12. 63
  13. 1
  14. 22
  15. 25
  16. 54
  17. 4
  18. 11
  19. 7750
  20. 12
  21. 6
  22. 3
  23. 41
  24. 12321
  25. 3
  26. 121
  27. Thursday
  28. 16
  29. 36000
  30. Saturday
  31. 11
  32. Friday
  33. 792
  34. 72
  35. 777777777
  36. 4
  37. 4
  38. 1089
  39. Tuesday
  40. 81

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