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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 497 · 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.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 6 years?
  2. 2.Take 89 and take away the sum of its digits. What do you get?
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.Think of 7. Multiply it by 4, then add 1. What number do you end with?
  5. 5.11 × 4 =
  6. 6.1 + 2 + 3 + … + 12 =
  7. 7.515? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.29 × 4 =
  9. 9.36 × 4 =
  10. 10.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 ? | 26 11 32. What is the missing number?
  11. 11.52 × 4 =
  12. 12.The 6th of a month is a Monday. What day is the 15th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  13. 13.27 × 4 =
  14. 14.Think of 14. Multiply it by 2, then add 5. What number do you end with?
  15. 15.1 + 3 + 5 + … + 21 =
  16. 16.10 × 9 =
  17. 17.I thought of a number, multiplied it by 4 and added 1. I got 13. What was my number?
  18. 18.Magic square (every row, column and diagonal has the same total): 8 ? 4 | 3 7 11 | 10 5 6. What is the missing number?
  19. 19.9 × 9 =
  20. 20.1 + 2 + 3 + … + 40 =
  21. 21.24 × 4 =
  22. 22.396 + 693 =
  23. 23.33 × 4 =
  24. 24.What comes next? 20, 24, 28, 32, ? (a) 37 (b) 32 (c) 36 (d) 40
  25. 25.1 + 3 + 5 + … + 13 =
  26. 26.I thought of a number, multiplied it by 4 and added 9. I got 21. What was my number?
  27. 27.1 + 2 + 3 + … + 60 =
  28. 28.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17
  29. 29.4 × ? = 400
  30. 30.37 × 24 =
  31. 31.9 × 8 = 7? — what is the missing digit?
  32. 32.693 + 396 =
  33. 33.908 × ? = 9080
  34. 34.49?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.9 × 3 =
  36. 36.910 × 10 =
  37. 37.I thought of a number, added 2 and then doubled it. I got 42. What was my number?
  38. 38.I thought of a number, multiplied it by 3 and added 7. I got 37. What was my number?
  39. 39.38 × 4 =
  40. 40.1 + 2 + 3 + … + 72 =

Answer key

  1. 15
  2. 72
  3. 1
  4. 29
  5. 44
  6. 78
  7. 7
  8. 116
  9. 144
  10. 17
  11. 208
  12. Wednesday
  13. 108
  14. 33
  15. 121
  16. 90
  17. 3
  18. 9
  19. 81
  20. 820
  21. 96
  22. 1089
  23. 132
  24. 36
  25. 49
  26. 3
  27. 1830
  28. 16
  29. 100
  30. 888
  31. 2
  32. 1089
  33. 10
  34. 3
  35. 27
  36. 9100
  37. 19
  38. 10
  39. 152
  40. 2628

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