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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 433 · 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. 1.1 + 3 + 5 + … + 39 =
  2. 2.Do the 1089 trick with 417: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.91 × ? = 9100
  4. 4.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 6 years?
  5. 5.Half of 76 =
  6. 6.111111 × 111111 =
  7. 7.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.Double 19 =
  9. 9.Take 87 and take away the sum of its digits. What do you get?
  10. 10.26 × 100 =
  11. 11.Double 16 =
  12. 12.5 × 9 =
  13. 13.1 + 2 + 3 + … + 43 =
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.If today is Wednesday, what day will it be after 8 days? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  16. 16.A father is 36 years old and his son is 12. How old was the father when the son was born?
  17. 17.50 × 4 =
  18. 18.69 × 100 =
  19. 19.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  20. 20.Take 84 and take away the sum of its digits. What do you get?
  21. 21.19 × 4 =
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.21 × 4 =
  24. 24.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
  26. 26.34? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.9 × 9 =
  28. 28.What comes next? 17, 20, 23, 26, ? (a) 29 (b) 30 (c) 32 (d) 26
  29. 29.9 × 10 =
  30. 30.If today is Monday, what day will it be after 10 days? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
  31. 31.61 × ? = 6100
  32. 32.9 × 9 = ?1 — what is the missing digit?
  33. 33.If today is Thursday, what day will it be after 86 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  34. 34.16 × 4 =
  35. 35.Take 39 and take away the sum of its digits. What do you get?
  36. 36.I thought of a number, multiplied it by 4 and added 9. I got 61. What was my number?
  37. 37.If today is Tuesday, what day was it 43 days ago? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  38. 38.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 100 (c) 98 (d) 101
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  40. 40.9 × 3 = 2? — what is the missing digit?

Answer key

  1. 400
  2. 1089
  3. 100
  4. 18
  5. 38
  6. 12345654321
  7. 1089
  8. 38
  9. 72
  10. 2600
  11. 32
  12. 45
  13. 946
  14. 3
  15. Thursday
  16. 24
  17. 200
  18. 6900
  19. 16
  20. 72
  21. 76
  22. 2
  23. 84
  24. 792
  25. 3
  26. 2
  27. 81
  28. 29
  29. 90
  30. Thursday
  31. 100
  32. 8
  33. Saturday
  34. 64
  35. 27
  36. 13
  37. Monday
  38. 100
  39. 594
  40. 7

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