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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 672 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  2. 2.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
  3. 3.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
  4. 4.44 × 4 =
  5. 5.I thought of a number, multiplied it by 4 and added 4. I got 12. What was my number?
  6. 6.I thought of a number, multiplied it by 4 and added 9. I got 49. What was my number?
  7. 7.9 × 9 = 8? — what is the missing digit?
  8. 8.56 × 100 =
  9. 9.9 × 2 = ?8 — what is the missing digit?
  10. 10.1 + 2 + 3 + … + 16 =
  11. 11.I thought of a number, added 3 and then doubled it. I got 46. What was my number?
  12. 12.Take 52 and take away the sum of its digits. What do you get?
  13. 13.The 2nd of a month is a Thursday. What day is the 21st of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  14. 14.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 25 | 16 ? 10. What is the missing number?
  15. 15.I thought of a number, multiplied it by 3 and added 7. I got 31. What was my number?
  16. 16.505? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.The 5th of a month is a Friday. What day is the 20th of the same month? (a) Saturday (b) Sunday (c) Tuesday (d) Friday
  18. 18.Half of 16 =
  19. 19.Take 12 and take away the sum of its digits. What do you get?
  20. 20.1 × 9 =
  21. 21.1 + 2 + 3 + … + 14 =
  22. 22.I thought of a number, multiplied it by 2 and added 6. I got 28. What was my number?
  23. 23.75? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Double 72 =
  25. 25.In 5 years a boy will be 13 years old. How old was he 7 years ago?
  26. 26.Magic square (every row, column and diagonal has the same total): 8 15 10 | 13 ? 9 | 12 7 14. What is the missing number?
  27. 27.Magic square (every row, column and diagonal has the same total): 14 15 10 | 9 13 17 | 16 11 ?. What is the missing number?
  28. 28.If today is Sunday, what day was it 25 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  29. 29.9 × 7 = ?3 — what is the missing digit?
  30. 30.12345679 × 36 =
  31. 31.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
  32. 32.29 × 4 =
  33. 33.11 × 11 =
  34. 34.17 × 4 =
  35. 35.In 4 years a boy will be 12 years old. How old was he 2 years ago?
  36. 36.12 × 4 =
  37. 37.1234567 × 8 + 7 =
  38. 38.Double 54 =
  39. 39.8 × ? = 8000
  40. 40.707? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 297
  2. 5
  3. 80
  4. 176
  5. 2
  6. 10
  7. 1
  8. 5600
  9. 1
  10. 136
  11. 20
  12. 45
  13. Tuesday
  14. 31
  15. 8
  16. 8
  17. Saturday
  18. 8
  19. 9
  20. 9
  21. 105
  22. 11
  23. 6
  24. 144
  25. 1
  26. 11
  27. 12
  28. Wednesday
  29. 6
  30. 444444444
  31. 3
  32. 116
  33. 121
  34. 68
  35. 6
  36. 48
  37. 9876543
  38. 108
  39. 1000
  40. 4

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