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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 312 · 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.Half of 32 =
  2. 2.Do the 1089 trick with 904: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.Magic trick! Think of 9. Double it, add 10, halve it, then take away 9. What number do you get?
  4. 4.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 ? | 13 3 17. What is the missing number?
  5. 5.Magic square (every row, column and diagonal has the same total): 18 3 24 | 21 15 9 | 6 ? 12. What is the missing number?
  6. 6.Magic square (every row, column and diagonal has the same total): 22 ? 28 | 25 19 13 | 10 31 16. What is the missing number?
  7. 7.792 + 297 =
  8. 8.9 × 3 = ?7 — what is the missing digit?
  9. 9.16 × 4 =
  10. 10.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Double 49 =
  12. 12.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 ? 23 | 14 29 8. What is the missing number?
  13. 13.6 × 4 =
  14. 14.9 × 2 =
  15. 15.37 × 6 =
  16. 16.If today is Friday, what day will it be after 84 days? (a) Saturday (b) Monday (c) Thursday (d) Friday
  17. 17.9 × 7 = ?3 — what is the missing digit?
  18. 18.9 × 9 = 8? — what is the missing digit?
  19. 19.9 × 10 = 9? — what is the missing digit?
  20. 20.9 × 5 = ?5 — what is the missing digit?
  21. 21.5?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.19 × 4 =
  23. 23.12345 × 9 + 6 =
  24. 24.Magic square (every row, column and diagonal has the same total): 11 21 7 | 9 13 17 | 19 ? 15. What is the missing number?
  25. 25.Magic trick! Think of 11. Double it, add 10, halve it, then take away 11. What number do you get?
  26. 26.25 × ? = 25000
  27. 27.891 + 198 =
  28. 28.Take 886. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.2 × 9 =
  30. 30.50?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.If today is Friday, what day was it 45 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  32. 32.Take 38 and take away the sum of its digits. What do you get?
  33. 33.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  35. 35.9 × 7 = 6? — what is the missing digit?
  36. 36.6 × 9 =
  37. 37.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
  38. 38.Double 97 =
  39. 39.3 × 9 =
  40. 40.Take 198. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 16
  2. 1089
  3. 5
  4. 7
  5. 27
  6. 7
  7. 1089
  8. 2
  9. 64
  10. 5
  11. 98
  12. 17
  13. 24
  14. 18
  15. 222
  16. Friday
  17. 6
  18. 1
  19. 0
  20. 4
  21. 1
  22. 76
  23. 111111
  24. 5
  25. 5
  26. 1000
  27. 1089
  28. 198
  29. 18
  30. 4
  31. Tuesday
  32. 27
  33. 5
  34. 594
  35. 3
  36. 54
  37. 5
  38. 194
  39. 27
  40. 693

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