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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 452 · 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. 1.3?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.The 8th of a month is a Wednesday. What day is the 17th of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
  3. 3.I thought of a number, added 7 and then doubled it. I got 50. What was my number?
  4. 4.5 × 1000 =
  5. 5.Take 136. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  6. 6.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 2 years?
  7. 7.Think of 12. Multiply it by 3, then add 5. What number do you end with?
  8. 8.Take 331. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.1 + 2 + 3 + … + 33 =
  10. 10.3?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.12345 × 9 + 6 =
  12. 12.Think of 15. Multiply it by 3, then add 9. What number do you end with?
  13. 13.9 × 3 = ?7 — what is the missing digit?
  14. 14.792 + 297 =
  15. 15.The 7th of a month is a Tuesday. What day is the 29th of the same month? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  16. 16.1 + 2 + 3 + … + 19 =
  17. 17.81?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Magic square (every row, column and diagonal has the same total): ? 9 24 | 15 21 27 | 18 33 12. What is the missing number?
  19. 19.Double 23 =
  20. 20.396 + 693 =
  21. 21.20?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.The 9th of a month is a Friday. What day is the 30th of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
  23. 23.I thought of a number, multiplied it by 4 and added 3. I got 27. What was my number?
  24. 24.510 × ? = 5100
  25. 25.9 × 8 = 7? — what is the missing digit?
  26. 26.Magic trick! Think of 4. Double it, add 16, halve it, then take away 4. What number do you get?
  27. 27.If today is Thursday, what day was it 55 days ago? (a) Thursday (b) Saturday (c) Friday (d) Monday
  28. 28.The 3rd of a month is a Monday. What day is the 28th of the same month? (a) Saturday (b) Monday (c) Friday (d) Thursday
  29. 29.In 4 years a boy will be 17 years old. How old was he 5 years ago?
  30. 30.Magic square (every row, column and diagonal has the same total): 17 ? 21 | 19 15 11 | 9 23 13. What is the missing number?
  31. 31.12345678 × 8 + 8 =
  32. 32.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.A father is 31 years old and his son is 6. How old was the father when the son was born?
  34. 34.123 × 8 + 3 =
  35. 35.What comes next? 7, 10, 13, 16, ? (a) 19 (b) 16 (c) 22 (d) 20
  36. 36.3 × 9 =
  37. 37.The 1st of a month is a Friday. What day is the 25th of the same month? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  38. 38.9 × 9 =
  39. 39.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
  40. 40.I thought of a number, added 3 and then doubled it. I got 36. What was my number?

Answer key

  1. 1
  2. Friday
  3. 18
  4. 5000
  5. 495
  6. 13
  7. 41
  8. 198
  9. 561
  10. 8
  11. 111111
  12. 54
  13. 2
  14. 1089
  15. Wednesday
  16. 190
  17. 7
  18. 30
  19. 46
  20. 1089
  21. 7
  22. Friday
  23. 6
  24. 10
  25. 2
  26. 8
  27. Friday
  28. Friday
  29. 8
  30. 7
  31. 98765432
  32. 792
  33. 25
  34. 987
  35. 19
  36. 27
  37. Monday
  38. 81
  39. 3
  40. 15

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