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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 394 · 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.If today is Thursday, what day will it be after 95 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  2. 2.Magic square (every row, column and diagonal has the same total): 24 ? 18 | 9 15 21 | 12 27 6. What is the missing number?
  3. 3.A father is 42 years old and his son is 8. How old was the father when the son was born?
  4. 4.43 × 4 =
  5. 5.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.36 × 1000 =
  7. 7.396 + 693 =
  8. 8.Magic square (every row, column and diagonal has the same total): 7 12 5 | 6 ? 10 | 11 4 9. What is the missing number?
  9. 9.Half of 154 =
  10. 10.9 × 6 =
  11. 11.18?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.1 + 2 + 3 + … + 37 =
  13. 13.Magic square (every row, column and diagonal has the same total): 17 ? 15 | 12 14 16 | 13 18 11. What is the missing number?
  14. 14.Double 26 =
  15. 15.Magic square (every row, column and diagonal has the same total): 21 24 9 | 6 ? 30 | 27 12 15. What is the missing number?
  16. 16.Think of 2. Multiply it by 2, then add 1. What number do you end with?
  17. 17.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 83 (c) 79 (d) 82
  18. 18.Half of 32 =
  19. 19.774 × 10 =
  20. 20.Double 17 =
  21. 21.I thought of a number, added 9 and then doubled it. I got 24. What was my number?
  22. 22.1 + 3 + 5 + … + 19 =
  23. 23.9 × 4 = ?6 — what is the missing digit?
  24. 24.1?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.78?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.In 2 years a boy will be 13 years old. How old was he 6 years ago?
  27. 27.Magic trick! Think of 12. Double it, add 16, halve it, then take away 12. What number do you get?
  28. 28.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 64 (d) 65
  29. 29.35 × 4 =
  30. 30.Double 67 =
  31. 31.552 × 10 =
  32. 32.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.9 × 4 = 3? — what is the missing digit?
  34. 34.9 × 3 =
  35. 35.Magic square (every row, column and diagonal has the same total): 11 21 19 | 25 17 9 | ? 13 23. What is the missing number?
  36. 36.The 9th of a month is a Tuesday. What day is the 30th of the same month? (a) Monday (b) Friday (c) Tuesday (d) Wednesday
  37. 37.Magic square (every row, column and diagonal has the same total): 10 25 22 | 31 ? 7 | 16 13 28. What is the missing number?
  38. 38.If today is Monday, what day was it 24 days ago? (a) Saturday (b) Thursday (c) Monday (d) Friday
  39. 39.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
  40. 40.1 + 2 + 3 + … + 13 =

Answer key

  1. Monday
  2. 3
  3. 34
  4. 172
  5. 1089
  6. 36000
  7. 1089
  8. 8
  9. 77
  10. 54
  11. 7
  12. 703
  13. 10
  14. 52
  15. 18
  16. 5
  17. 81
  18. 16
  19. 7740
  20. 34
  21. 3
  22. 100
  23. 3
  24. 5
  25. 7
  26. 5
  27. 8
  28. 64
  29. 140
  30. 134
  31. 5520
  32. 1089
  33. 6
  34. 27
  35. 15
  36. Tuesday
  37. 19
  38. Friday
  39. 4
  40. 91

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