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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 560 · 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.Half of 76 =
  2. 2.1234567 × 9 + 8 =
  3. 3.9 × 6 =
  4. 4.Half of 26 =
  5. 5.Double 12 =
  6. 6.22 × ? = 2200
  7. 7.1 + 3 + 5 + … + 23 =
  8. 8.In 3 years a boy will be 17 years old. How old was he 3 years ago?
  9. 9.29 × 4 =
  10. 10.30 × 4 =
  11. 11.Do the 1089 trick with 608: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.9 × 8 = ?2 — what is the missing digit?
  13. 13.12345679 × 9 =
  14. 14.41 × 100 =
  15. 15.792 + 297 =
  16. 16.If today is Wednesday, what day was it 14 days ago? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  17. 17.12 × 4 =
  18. 18.Double 79 =
  19. 19.732 × 10 =
  20. 20.The 8th of a month is a Saturday. What day is the 24th of the same month? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  21. 21.I thought of a number, multiplied it by 2 and added 3. I got 33. What was my number?
  22. 22.297 + 792 =
  23. 23.Magic square (every row, column and diagonal has the same total): 18 21 ? | 3 15 27 | 24 9 12. What is the missing number?
  24. 24.A father is 32 years old and his son is 11. How old was the father when the son was born?
  25. 25.52 × 4 =
  26. 26.I thought of a number, multiplied it by 2 and added 3. I got 21. What was my number?
  27. 27.23 × 4 =
  28. 28.1 + 2 + 3 + … + 31 =
  29. 29.1?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 30 (c) 25 (d) 22
  31. 31.I thought of a number, added 3 and then doubled it. I got 18. What was my number?
  32. 32.1 + 2 + 3 + … + 23 =
  33. 33.20 × 4 =
  34. 34.123 × 8 + 3 =
  35. 35.77?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6 × 9 =
  37. 37.78?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.111 × 111 =
  39. 39.1 + 3 + 5 + … + 47 =
  40. 40.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14

Answer key

  1. 38
  2. 11111111
  3. 54
  4. 13
  5. 24
  6. 100
  7. 144
  8. 11
  9. 116
  10. 120
  11. 1089
  12. 7
  13. 111111111
  14. 4100
  15. 1089
  16. Wednesday
  17. 48
  18. 158
  19. 7320
  20. Monday
  21. 15
  22. 1089
  23. 6
  24. 21
  25. 208
  26. 9
  27. 92
  28. 496
  29. 8
  30. 22
  31. 6
  32. 276
  33. 80
  34. 987
  35. 4
  36. 54
  37. 9
  38. 12321
  39. 576
  40. 16

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