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1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 712 · 40 questions
TalentJR

The trick (Reverse and subtract): Reverse the number and take the smaller number away from the bigger one. The answer is always one of 198, 297, 396, 495, 594, 693, 792, 891: middle digit 9, first and last digits adding to 9. Reverse that answer and add: you always get 1089.

NameDateTime takenScore ___ / 40
  1. 1.297 + 792 =
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  3. 3.Do the 1089 trick with 917: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.Do the 1089 trick with 299: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.Do the 1089 trick with 831: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.Do the 1089 trick with 820: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.Do the 1089 trick with 218: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.Do the 1089 trick with 148: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  10. 10.Do the 1089 trick with 994: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.Do the 1089 trick with 913: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.198 + 891 =
  14. 14.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  16. 16.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Take 164. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Take 149. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  20. 20.Do the 1089 trick with 996: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.Do the 1089 trick with 390: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.Take 523. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.Take 852. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.Do the 1089 trick with 972: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  26. 26.Take 664. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.Do the 1089 trick with 654: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.594 + 495 =
  29. 29.Do the 1089 trick with 442: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.Take 220. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.Do the 1089 trick with 600: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.792 + 297 =
  34. 34.Take 823. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  35. 35.Take 881. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.Do the 1089 trick with 118: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.Do the 1089 trick with 154: reverse and subtract, then reverse that answer and add. What do you get?
  39. 39.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Do the 1089 trick with 277: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 1089
  2. 297
  3. 1089
  4. 1089
  5. 1089
  6. 1089
  7. 1089
  8. 1089
  9. 594
  10. 1089
  11. 891
  12. 1089
  13. 1089
  14. 891
  15. 693
  16. 891
  17. 297
  18. 792
  19. 792
  20. 1089
  21. 1089
  22. 198
  23. 594
  24. 1089
  25. 891
  26. 198
  27. 1089
  28. 1089
  29. 1089
  30. 198
  31. 1089
  32. 1089
  33. 1089
  34. 495
  35. 693
  36. 792
  37. 1089
  38. 1089
  39. 1089
  40. 1089

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