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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 777 · 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. 1.198 + 891 =
  2. 2.Half of 114 =
  3. 3.A father is 43 years old and his son is 9. How old was the father when the son was born?
  4. 4.81 × ? = 810
  5. 5.11 × 11 =
  6. 6.28 × 100 =
  7. 7.If today is Tuesday, what day was it 31 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  8. 8.1 + 3 + 5 + … + 11 =
  9. 9.173 × 10 =
  10. 10.What comes next? 2, 7, 12, 17, ? (a) 23 (b) 17 (c) 22 (d) 27
  11. 11.Half of 34 =
  12. 12.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
  13. 13.12345679 × 63 =
  14. 14.9 × 8 = 7? — what is the missing digit?
  15. 15.4?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.37 × 15 =
  17. 17.Half of 134 =
  18. 18.35 × 4 =
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  20. 20.I thought of a number, multiplied it by 3 and added 1. I got 31. What was my number?
  21. 21.Take 34 and take away the sum of its digits. What do you get?
  22. 22.9 × 7 = ?3 — what is the missing digit?
  23. 23.7 × 9 =
  24. 24.221? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Think of 3. Multiply it by 2, then add 3. What number do you end with?
  26. 26.1 + 2 + 3 + … + 17 =
  27. 27.Double 41 =
  28. 28.9 × 5 = ?5 — what is the missing digit?
  29. 29.Magic square (every row, column and diagonal has the same total): 5 ? 7 | 10 8 6 | 9 4 11. What is the missing number?
  30. 30.9 × 1 =
  31. 31.Double 69 =
  32. 32.994 × ? = 9940
  33. 33.Double 73 =
  34. 34.Magic square (every row, column and diagonal has the same total): 15 17 7 | 5 13 ? | 19 9 11. What is the missing number?
  35. 35.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 10 14 | 11 ? 7. What is the missing number?
  36. 36.9 × 5 =
  37. 37.1234 × 8 + 4 =
  38. 38.25?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.19 × 4 =
  40. 40.Magic square (every row, column and diagonal has the same total): 5 15 ? | 19 11 3 | 9 7 17. What is the missing number?

Answer key

  1. 1089
  2. 57
  3. 34
  4. 10
  5. 121
  6. 2800
  7. Saturday
  8. 36
  9. 1730
  10. 22
  11. 17
  12. 8
  13. 777777777
  14. 2
  15. 9
  16. 555
  17. 67
  18. 140
  19. 693
  20. 10
  21. 27
  22. 6
  23. 63
  24. 4
  25. 9
  26. 153
  27. 82
  28. 4
  29. 12
  30. 9
  31. 138
  32. 10
  33. 146
  34. 21
  35. 12
  36. 45
  37. 9876
  38. 2
  39. 76
  40. 13

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