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1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 380 · 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.Do the 1089 trick with 610: reverse and subtract, then reverse that answer and add. What do you get?
  2. 2.297 + 792 =
  3. 3.Take 628. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.Take 735. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.693 + 396 =
  6. 6.Take 256. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.Do the 1089 trick with 279: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.792 + 297 =
  9. 9.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?
  10. 10.Do the 1089 trick with 781: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  12. 12.Do the 1089 trick with 804: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.198 + 891 =
  14. 14.Take 701. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Take 127. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.Do the 1089 trick with 193: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.Take 147. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  20. 20.Take 136. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.Take 933. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.Do the 1089 trick with 974: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  24. 24.Do the 1089 trick with 581: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.Do the 1089 trick with 199: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.Take 176. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.Do the 1089 trick with 991: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.Take 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.Do the 1089 trick with 357: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Do the 1089 trick with 854: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.495 + 594 =
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  35. 35.Do the 1089 trick with 688: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  37. 37.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.Take 219. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.891 + 198 =
  40. 40.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 1089
  2. 1089
  3. 198
  4. 198
  5. 1089
  6. 396
  7. 1089
  8. 1089
  9. 1089
  10. 1089
  11. 495
  12. 1089
  13. 1089
  14. 594
  15. 594
  16. 1089
  17. 594
  18. 1089
  19. 198
  20. 495
  21. 594
  22. 1089
  23. 792
  24. 1089
  25. 1089
  26. 792
  27. 495
  28. 1089
  29. 792
  30. 1089
  31. 792
  32. 1089
  33. 1089
  34. 693
  35. 1089
  36. 891
  37. 792
  38. 693
  39. 1089
  40. 594

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