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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 834 · 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 father is 44 years old and his son is 10. How old was the father when the son was born?
  2. 2.36 × 4 =
  3. 3.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | 6 ? 10. What is the missing number?
  4. 4.1 + 2 + 3 + … + 71 =
  5. 5.2 × 100 =
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  7. 7.12345679 × 72 =
  8. 8.9 × 6 = 5? — what is the missing digit?
  9. 9.9 × 4 =
  10. 10.15 × 100 =
  11. 11.Think of 15. Multiply it by 4, then add 5. What number do you end with?
  12. 12.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.If today is Sunday, what day will it be after 16 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  14. 14.Magic square (every row, column and diagonal has the same total): 11 16 9 | ? 12 14 | 15 8 13. What is the missing number?
  15. 15.Half of 116 =
  16. 16.12345 × 8 + 5 =
  17. 17.9 × 5 = 4? — what is the missing digit?
  18. 18.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 5 years?
  19. 19.10 × 9 =
  20. 20.37 × 3 =
  21. 21.The 2nd of a month is a Thursday. What day is the 25th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  22. 22.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 2 years?
  23. 23.693 + 396 =
  24. 24.I thought of a number, multiplied it by 5 and added 1. I got 11. What was my number?
  25. 25.576 × 10 =
  26. 26.1 + 3 + 5 + … + 17 =
  27. 27.9 × 9 =
  28. 28.A father is 39 years old and his son is 6. How old was the father when the son was born?
  29. 29.1 + 3 + 5 + … + 27 =
  30. 30.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 ? | 13 3 17. What is the missing number?
  31. 31.9 × 7 = ?3 — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 13 28 7 | 10 16 22 | 25 ? 19. What is the missing number?
  33. 33.Do the 1089 trick with 830: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.The 7th of a month is a Monday. What day is the 24th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  35. 35.1 + 2 + 3 + … + 94 =
  36. 36.79 × ? = 790
  37. 37.15 × 4 =
  38. 38.8 × 1000 =
  39. 39.9 × 2 = ?8 — what is the missing digit?
  40. 40.16 × 4 =

Answer key

  1. 34
  2. 144
  3. 5
  4. 2556
  5. 200
  6. 198
  7. 888888888
  8. 4
  9. 36
  10. 1500
  11. 65
  12. 891
  13. Tuesday
  14. 10
  15. 58
  16. 98765
  17. 5
  18. 23
  19. 90
  20. 111
  21. Saturday
  22. 12
  23. 1089
  24. 2
  25. 5760
  26. 81
  27. 81
  28. 33
  29. 196
  30. 7
  31. 6
  32. 4
  33. 1089
  34. Thursday
  35. 4465
  36. 10
  37. 60
  38. 8000
  39. 1
  40. 64

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