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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 977 · 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 42 years old and his son is 12. How old was the father when the son was born?
  2. 2.11 × 4 =
  3. 3.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 9 13 17 | 19 5 15. What is the missing number?
  4. 4.If today is Saturday, what day was it 20 days ago? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
  5. 5.14 × 4 =
  6. 6.39 × 4 =
  7. 7.2 × 9 =
  8. 8.7 × 9 =
  9. 9.Take 92 and take away the sum of its digits. What do you get?
  10. 10.I thought of a number, added 4 and then doubled it. I got 42. What was my number?
  11. 11.12345679 × 36 =
  12. 12.A father is 38 years old and his son is 10. How old was the father when the son was born?
  13. 13.Do the 1089 trick with 126: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.Take 80 and take away the sum of its digits. What do you get?
  15. 15.Take 479. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  17. 17.5 × 9 =
  18. 18.Take 926. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.I thought of a number, multiplied it by 3 and added 6. I got 15. What was my number?
  20. 20.16 × 100 =
  21. 21.I thought of a number, added 2 and then doubled it. I got 24. What was my number?
  22. 22.323 × 10 =
  23. 23.Take 36 and take away the sum of its digits. What do you get?
  24. 24.Magic square (every row, column and diagonal has the same total): 3 10 5 | ? 6 4 | 7 2 9. What is the missing number?
  25. 25.If today is Monday, what day will it be after 13 days? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  26. 26.9 × 7 = ?3 — what is the missing digit?
  27. 27.Odd one out: which number is NOT in the 3 times table? (a) 30 (b) 21 (c) 12 (d) 23
  28. 28.Double 89 =
  29. 29.9 × 5 = 4? — what is the missing digit?
  30. 30.The 9th of a month is a Saturday. What day is the 23rd of the same month? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  31. 31.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
  32. 32.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.9 × 7 =
  34. 34.891 + 198 =
  35. 35.What comes next? 17, 25, 33, 41, ? (a) 57 (b) 50 (c) 49 (d) 41
  36. 36.15 × 4 =
  37. 37.A father is 34 years old and his son is 11. How old was the father when the son was born?
  38. 38.1 + 3 + 5 + … + 13 =
  39. 39.?590 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.6 × 1000 =

Answer key

  1. 30
  2. 44
  3. 21
  4. Sunday
  5. 56
  6. 156
  7. 18
  8. 63
  9. 81
  10. 17
  11. 444444444
  12. 28
  13. 1089
  14. 72
  15. 495
  16. 5
  17. 45
  18. 297
  19. 3
  20. 1600
  21. 10
  22. 3230
  23. 27
  24. 8
  25. Sunday
  26. 6
  27. 23
  28. 178
  29. 5
  30. Saturday
  31. 18
  32. 792
  33. 63
  34. 1089
  35. 49
  36. 60
  37. 23
  38. 49
  39. 4
  40. 6000

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