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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 93 · 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. 1.12345679 × 18 =
  2. 2.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 2 years?
  3. 3.9 × 9 = 8? — what is the missing digit?
  4. 4.12345679 × 36 =
  5. 5.I thought of a number, added 8 and then doubled it. I got 22. What was my number?
  6. 6.2?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.In 3 years a boy will be 12 years old. How old was he 3 years ago?
  9. 9.4 × 9 =
  10. 10.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.9 × 3 = ?7 — what is the missing digit?
  12. 12.9 × 4 =
  13. 13.Double 41 =
  14. 14.47 × 100 =
  15. 15.9 × 2 = ?8 — what is the missing digit?
  16. 16.49 × ? = 49000
  17. 17.7?19 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, multiplied it by 5 and added 1. I got 51. What was my number?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  20. 20.If today is Monday, what day was it 15 days ago? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  21. 21.891 + 198 =
  22. 22.12345679 × 45 =
  23. 23.The 3rd of a month is a Thursday. What day is the 12th of the same month? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  24. 24.Do the 1089 trick with 912: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.9 × 4 = ?6 — what is the missing digit?
  26. 26.1 + 3 + 5 + … + 29 =
  27. 27.I thought of a number, multiplied it by 3 and added 7. I got 43. What was my number?
  28. 28.23?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Magic trick! Think of 8. Double it, add 16, halve it, then take away 8. What number do you get?
  30. 30.9 × 7 = 6? — what is the missing digit?
  31. 31.Double 65 =
  32. 32.7?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  34. 34.1 + 2 + 3 + … + 81 =
  35. 35.I thought of a number, multiplied it by 4 and added 1. I got 61. What was my number?
  36. 36.Think of 7. Multiply it by 4, then add 4. What number do you end with?
  37. 37.Magic trick! Think of 5. Double it, add 18, halve it, then take away 5. What number do you get?
  38. 38.I thought of a number, added 2 and then doubled it. I got 36. What was my number?
  39. 39.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 5 years?
  40. 40.Take 91 and take away the sum of its digits. What do you get?

Answer key

  1. 222222222
  2. 18
  3. 1
  4. 444444444
  5. 3
  6. 2
  7. 0
  8. 6
  9. 36
  10. 891
  11. 2
  12. 36
  13. 82
  14. 4700
  15. 1
  16. 1000
  17. 1
  18. 10
  19. 891
  20. Sunday
  21. 1089
  22. 555555555
  23. Saturday
  24. 1089
  25. 3
  26. 225
  27. 12
  28. 2
  29. 8
  30. 3
  31. 130
  32. 5
  33. 5
  34. 3321
  35. 15
  36. 32
  37. 9
  38. 16
  39. 14
  40. 81

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