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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 583 · 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.Take 83 and take away the sum of its digits. What do you get?
  2. 2.37 × 3 =
  3. 3.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.12345679 × 9 =
  5. 5.23 × 4 =
  6. 6.53 × 4 =
  7. 7.9 × 3 =
  8. 8.?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.57 × 4 =
  10. 10.I thought of a number, multiplied it by 4 and added 3. I got 59. What was my number?
  11. 11.6 × 9 =
  12. 12.The ages of two twins add up to 20. How old is each twin?
  13. 13.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 81 (d) 82
  14. 14.18 × 4 =
  15. 15.49 × 4 =
  16. 16.If today is Sunday, what day will it be after 94 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  17. 17.1 + 3 + 5 + … + 29 =
  18. 18.198 + 891 =
  19. 19.1 + 3 + 5 + … + 13 =
  20. 20.1 + 2 + 3 + … + 98 =
  21. 21.Magic square (every row, column and diagonal has the same total): 21 ? 15 | 18 24 30 | 33 12 27. What is the missing number?
  22. 22.Do the 1089 trick with 739: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.7 × 100 =
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  25. 25.9 × 8 = ?2 — what is the missing digit?
  26. 26.5 × 9 =
  27. 27.Magic square (every row, column and diagonal has the same total): ? 27 24 | 33 21 9 | 18 15 30. What is the missing number?
  28. 28.123456 × 9 + 7 =
  29. 29.9 × 3 = ?7 — what is the missing digit?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  31. 31.839? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.495 + 594 =
  33. 33.1 + 3 + 5 + … + 27 =
  34. 34.Think of 11. Multiply it by 2, then add 7. What number do you end with?
  35. 35.58 × 4 =
  36. 36.9 × 2 = 1? — what is the missing digit?
  37. 37.Magic square (every row, column and diagonal has the same total): 7 6 11 | 12 8 4 | 5 ? 9. What is the missing number?
  38. 38.111111 × 111111 =
  39. 39.1234 × 8 + 4 =
  40. 40.9 × 7 = 6? — what is the missing digit?

Answer key

  1. 72
  2. 111
  3. 1089
  4. 111111111
  5. 92
  6. 212
  7. 27
  8. 6
  9. 228
  10. 14
  11. 54
  12. 10
  13. 81
  14. 72
  15. 196
  16. Wednesday
  17. 225
  18. 1089
  19. 49
  20. 4851
  21. 36
  22. 1089
  23. 700
  24. 396
  25. 7
  26. 45
  27. 12
  28. 1111111
  29. 2
  30. 297
  31. 7
  32. 1089
  33. 196
  34. 29
  35. 232
  36. 8
  37. 10
  38. 12345654321
  39. 9876
  40. 3

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