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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 99 · 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 82 =
  2. 2.10 × 9 =
  3. 3.13 × 100 =
  4. 4.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.42 × 1000 =
  6. 6.693 + 396 =
  7. 7.Double 35 =
  8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  9. 9.9 × 6 =
  10. 10.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 70 (d) 80
  11. 11.Take 74 and take away the sum of its digits. What do you get?
  12. 12.9 × 8 = ?2 — what is the missing digit?
  13. 13.601? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.2 × 9 =
  15. 15.35 × 4 =
  16. 16.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 79 (d) 81
  17. 17.1234567 × 9 + 8 =
  18. 18.Double 39 =
  19. 19.Take 47 and take away the sum of its digits. What do you get?
  20. 20.97 × ? = 9700
  21. 21.Double 28 =
  22. 22.40 × 4 =
  23. 23.37 × 15 =
  24. 24.9 × 5 =
  25. 25.123456 × 8 + 6 =
  26. 26.1 + 2 + 3 + … + 79 =
  27. 27.8 × 4 =
  28. 28.I thought of a number, added 9 and then doubled it. I got 32. What was my number?
  29. 29.49 × 4 =
  30. 30.Think of 6. Multiply it by 5, then add 2. What number do you end with?
  31. 31.If today is Friday, what day will it be after 44 days? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  32. 32.?402 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.If today is Monday, what day will it be after 34 days? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
  34. 34.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
  35. 35.5?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.3 × 9 =
  37. 37.37 × 12 =
  38. 38.Take 369. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.What comes next? 13, 16, 19, 22, ? (a) 26 (b) 22 (c) 28 (d) 25
  40. 40.I thought of a number, added 9 and then doubled it. I got 24. What was my number?

Answer key

  1. 164
  2. 90
  3. 1300
  4. 891
  5. 42000
  6. 1089
  7. 70
  8. 198
  9. 54
  10. 80
  11. 63
  12. 7
  13. 2
  14. 18
  15. 140
  16. 81
  17. 11111111
  18. 78
  19. 36
  20. 100
  21. 56
  22. 160
  23. 555
  24. 45
  25. 987654
  26. 3160
  27. 32
  28. 7
  29. 196
  30. 32
  31. Sunday
  32. 3
  33. Sunday
  34. 5
  35. 5
  36. 27
  37. 444
  38. 594
  39. 25
  40. 3

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