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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 522 · 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 × 9 = 8? — what is the missing digit?
  2. 2.9 × 2 =
  3. 3.Think of 15. Multiply it by 3, then add 2. What number do you end with?
  4. 4.Take 658. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.12345679 × 18 =
  6. 6.9 × 4 = 3? — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 ? 27 | 25 15 17. What is the missing number?
  8. 8.Think of 12. Multiply it by 3, then add 3. What number do you end with?
  9. 9.858? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.70 × 10 =
  11. 11.15 × 4 =
  12. 12.Take 78 and take away the sum of its digits. What do you get?
  13. 13.55?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.51 × 4 =
  15. 15.Take 98 and take away the sum of its digits. What do you get?
  16. 16.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 79 (d) 82
  17. 17.32 × 1000 =
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  19. 19.What comes next? 13, 17, 21, 25, ? (a) 29 (b) 33 (c) 25 (d) 30
  20. 20.Think of 10. Multiply it by 5, then add 2. What number do you end with?
  21. 21.7?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.4 × 1000 =
  23. 23.Take 33 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): 21 23 13 | 11 19 27 | 25 ? 17. What is the missing number?
  25. 25.34 × 10 =
  26. 26.If today is Friday, what day will it be after 26 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  27. 27.?401 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.What comes next? 3, 8, 13, 18, ? (a) 24 (b) 23 (c) 28 (d) 18
  29. 29.9 × 10 =
  30. 30.Magic square (every row, column and diagonal has the same total): ? 16 9 | 10 12 14 | 15 8 13. What is the missing number?
  31. 31.?116 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 85 and take away the sum of its digits. What do you get?
  33. 33.12345679 × 81 =
  34. 34.If today is Tuesday, what day was it 38 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  35. 35.10 × 9 =
  36. 36.Magic square (every row, column and diagonal has the same total): 19 5 15 | 9 13 17 | 11 ? 7. What is the missing number?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  38. 38.A father is 32 years old and his son is 9. How old was the father when the son was born?
  39. 39.1 + 2 + 3 + … + 57 =
  40. 40.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17

Answer key

  1. 1
  2. 18
  3. 47
  4. 198
  5. 222222222
  6. 6
  7. 19
  8. 39
  9. 6
  10. 700
  11. 60
  12. 63
  13. 5
  14. 204
  15. 81
  16. 81
  17. 32000
  18. 891
  19. 29
  20. 52
  21. 5
  22. 4000
  23. 27
  24. 15
  25. 340
  26. Wednesday
  27. 4
  28. 23
  29. 90
  30. 11
  31. 1
  32. 72
  33. 999999999
  34. Saturday
  35. 90
  36. 21
  37. 792
  38. 23
  39. 1653
  40. 16

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