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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 58 · 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. 1.43 × 4 =
  2. 2.If today is Tuesday, what day was it 10 days ago? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  4. 4.I thought of a number, added 8 and then doubled it. I got 42. What was my number?
  5. 5.Double 71 =
  6. 6.Take 651. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.39 × ? = 3900
  8. 8.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 13 | 22 ? 28. What is the missing number?
  9. 9.323 × 10 =
  10. 10.12345679 × 18 =
  11. 11.9 × 6 = 5? — what is the missing digit?
  12. 12.Magic trick! Think of 6. Double it, add 14, halve it, then take away 6. What number do you get?
  13. 13.46 × ? = 46000
  14. 14.9 × 3 = 2? — what is the missing digit?
  15. 15.If today is Thursday, what day will it be after 27 days? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  16. 16.Take 166. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.?385 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.In 2 years a boy will be 13 years old. How old was he 4 years ago?
  19. 19.1 + 3 + 5 + … + 37 =
  20. 20.Half of 12 =
  21. 21.I thought of a number, added 4 and then doubled it. I got 36. What was my number?
  22. 22.Take 871. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.If today is Wednesday, what day was it 51 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  24. 24.If today is Friday, what day will it be after 87 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  25. 25.I thought of a number, added 7 and then doubled it. I got 22. What was my number?
  26. 26.58 × 4 =
  27. 27.992 × 10 =
  28. 28.9 × 3 =
  29. 29.Magic square (every row, column and diagonal has the same total): 27 6 21 | ? 18 24 | 15 30 9. What is the missing number?
  30. 30.9 × 3 = ?7 — what is the missing digit?
  31. 31.495 + 594 =
  32. 32.9 × 2 =
  33. 33.The 3rd of a month is a Tuesday. What day is the 14th of the same month? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  34. 34.2?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Double 29 =
  36. 36.1 + 3 + 5 + … + 17 =
  37. 37.37 × 3 =
  38. 38.10 × 9 =
  39. 39.37 × ? = 37000
  40. 40.3 × 100 =

Answer key

  1. 172
  2. Saturday
  3. 396
  4. 13
  5. 142
  6. 495
  7. 100
  8. 7
  9. 3230
  10. 222222222
  11. 4
  12. 7
  13. 1000
  14. 7
  15. Wednesday
  16. 495
  17. 2
  18. 7
  19. 361
  20. 6
  21. 14
  22. 693
  23. Monday
  24. Monday
  25. 4
  26. 232
  27. 9920
  28. 27
  29. 12
  30. 2
  31. 1089
  32. 18
  33. Saturday
  34. 1
  35. 58
  36. 81
  37. 111
  38. 90
  39. 1000
  40. 300

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