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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 713 · 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. 1.9 × 7 = ?3 — what is the missing digit?
  2. 2.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  3. 3.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 ? 29 | 26 11 14. What is the missing number?
  4. 4.I thought of a number, multiplied it by 3 and added 8. I got 41. What was my number?
  5. 5.Half of 94 =
  6. 6.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 17 ? | 26 11 14. What is the missing number?
  7. 7.38?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Half of 152 =
  9. 9.21 × 1000 =
  10. 10.Magic square (every row, column and diagonal has the same total): 19 ? 25 | 22 16 10 | 7 28 13. What is the missing number?
  11. 11.1 + 3 + 5 + … + 47 =
  12. 12.Magic square (every row, column and diagonal has the same total): 27 ? 33 | 30 24 18 | 15 36 21. What is the missing number?
  13. 13.1234 × 8 + 4 =
  14. 14.25 × 4 =
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  16. 16.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 80 (d) 60
  17. 17.Double 35 =
  18. 18.1 + 2 + 3 + … + 87 =
  19. 19.Magic square (every row, column and diagonal has the same total): 8 18 4 | 6 10 ? | 16 2 12. What is the missing number?
  20. 20.I thought of a number, multiplied it by 3 and added 8. I got 17. What was my number?
  21. 21.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 100 (c) 102 (d) 98
  22. 22.36 × 4 =
  23. 23.111111 × 111111 =
  24. 24.If today is Saturday, what day will it be after 56 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  25. 25.24?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.9 × 8 =
  27. 27.9 × 1 =
  28. 28.24?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Magic square (every row, column and diagonal has the same total): 13 6 ? | 8 10 12 | 9 14 7. What is the missing number?
  30. 30.9 × 4 = ?6 — what is the missing digit?
  31. 31.53 × 100 =
  32. 32.?044 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Half of 62 =
  34. 34.564 × 10 =
  35. 35.Take 931. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): ? 10 12 | 6 14 22 | 16 18 8. What is the missing number?
  37. 37.Take 618. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.Take 63 and take away the sum of its digits. What do you get?
  39. 39.7 × 9 =
  40. 40.Take 80 and take away the sum of its digits. What do you get?

Answer key

  1. 6
  2. 16
  3. 17
  4. 11
  5. 47
  6. 29
  7. 5
  8. 76
  9. 21000
  10. 4
  11. 576
  12. 12
  13. 9876
  14. 100
  15. 495
  16. 80
  17. 70
  18. 3828
  19. 14
  20. 3
  21. 100
  22. 144
  23. 12345654321
  24. Saturday
  25. 5
  26. 72
  27. 9
  28. 3
  29. 11
  30. 3
  31. 5300
  32. 1
  33. 31
  34. 5640
  35. 792
  36. 20
  37. 198
  38. 54
  39. 63
  40. 72

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