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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 832 · 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 35 years old and his son is 14. How old was the father when the son was born?
  2. 2.3 × 9 =
  3. 3.1 + 3 + 5 + … + 49 =
  4. 4.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 ? 35 | 26 29 14. What is the missing number?
  5. 5.11 × ? = 11000
  6. 6.9 × 10 = ?0 — what is the missing digit?
  7. 7.9 × 7 = ?3 — what is the missing digit?
  8. 8.594 + 495 =
  9. 9.Magic square (every row, column and diagonal has the same total): 13 10 ? | 28 16 4 | 7 22 19. What is the missing number?
  10. 10.If today is Thursday, what day will it be after 29 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
  11. 11.52 × 4 =
  12. 12.Take 97 and take away the sum of its digits. What do you get?
  13. 13.628 × 10 =
  14. 14.9 × 9 = ?1 — what is the missing digit?
  15. 15.9 × 8 = ?2 — what is the missing digit?
  16. 16.12 × 4 =
  17. 17.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 49 (c) 48 (d) 36
  18. 18.Double 82 =
  19. 19.28 × 4 =
  20. 20.The 9th of a month is a Tuesday. What day is the 20th of the same month? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
  21. 21.7 × 9 =
  22. 22.Magic trick! Think of 20. Double it, add 18, halve it, then take away 20. What number do you get?
  23. 23.A father is 38 years old and his son is 7. How old was the father when the son was born?
  24. 24.1 + 3 + 5 + … + 19 =
  25. 25.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
  26. 26.Double 92 =
  27. 27.410 × 10 =
  28. 28.9 × 8 = 7? — what is the missing digit?
  29. 29.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.Do the 1089 trick with 512: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.15 × 1000 =
  32. 32.I thought of a number, multiplied it by 3 and added 8. I got 20. What was my number?
  33. 33.In 4 years a boy will be 18 years old. How old was he 2 years ago?
  34. 34.14 × ? = 14000
  35. 35.9 × 8 =
  36. 36.77?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.If today is Sunday, what day was it 16 days ago? (a) Monday (b) Friday (c) Saturday (d) Thursday
  38. 38.11111 × 11111 =
  39. 39.Think of 13. Multiply it by 2, then add 2. What number do you end with?
  40. 40.Half of 14 =

Answer key

  1. 21
  2. 27
  3. 625
  4. 23
  5. 1000
  6. 9
  7. 6
  8. 1089
  9. 25
  10. Friday
  11. 208
  12. 81
  13. 6280
  14. 8
  15. 7
  16. 48
  17. 48
  18. 164
  19. 112
  20. Saturday
  21. 63
  22. 9
  23. 31
  24. 100
  25. 4
  26. 184
  27. 4100
  28. 2
  29. 891
  30. 1089
  31. 15000
  32. 4
  33. 12
  34. 1000
  35. 72
  36. 2
  37. Friday
  38. 123454321
  39. 28
  40. 7

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