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1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 305 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  2. 2.198 + 891 =
  3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  4. 4.594 + 495 =
  5. 5.Do the 1089 trick with 276: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.Take 218. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.396 + 693 =
  9. 9.693 + 396 =
  10. 10.Do the 1089 trick with 670: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
  12. 12.Take 238. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.495 + 594 =
  14. 14.Take 491. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.891 + 198 =
  16. 16.Take 346. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.Take 901. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.Take 911. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.Do the 1089 trick with 328: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  22. 22.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.Take 109. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.Do the 1089 trick with 870: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.Do the 1089 trick with 285: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.Do the 1089 trick with 811: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.Take 370. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  31. 31.Take 486. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Do the 1089 trick with 470: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  34. 34.297 + 792 =
  35. 35.Take 460. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.Do the 1089 trick with 167: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.Take 983. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Do the 1089 trick with 430: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 792
  2. 1089
  3. 198
  4. 1089
  5. 1089
  6. 594
  7. 1089
  8. 1089
  9. 1089
  10. 1089
  11. 1089
  12. 594
  13. 1089
  14. 297
  15. 1089
  16. 297
  17. 1089
  18. 792
  19. 792
  20. 1089
  21. 495
  22. 594
  23. 891
  24. 1089
  25. 792
  26. 1089
  27. 1089
  28. 1089
  29. 297
  30. 297
  31. 198
  32. 1089
  33. 396
  34. 1089
  35. 396
  36. 891
  37. 1089
  38. 594
  39. 1089
  40. 1089

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