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1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 30 · 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.Take 693. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.792 + 297 =
  3. 3.495 + 594 =
  4. 4.Do the 1089 trick with 305: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  6. 6.Do the 1089 trick with 622: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  8. 8.Take 632. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.693 + 396 =
  10. 10.Take 773. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  12. 12.Do the 1089 trick with 176: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.396 + 693 =
  14. 14.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  16. 16.Do the 1089 trick with 259: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.Take 311. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Do the 1089 trick with 964: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.891 + 198 =
  20. 20.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  22. 22.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  24. 24.Do the 1089 trick with 611: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.Take 942. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.Take 755. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.Do the 1089 trick with 482: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.Take 370. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Do the 1089 trick with 193: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.Take 911. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.Take 710. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Take 956. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.Do the 1089 trick with 996: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.Take 986. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  35. 35.Do the 1089 trick with 398: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.198 + 891 =
  37. 37.Do the 1089 trick with 527: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.Do the 1089 trick with 771: reverse and subtract, then reverse that answer and add. What do you get?
  39. 39.Do the 1089 trick with 250: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Do the 1089 trick with 901: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 297
  2. 1089
  3. 1089
  4. 1089
  5. 891
  6. 1089
  7. 198
  8. 396
  9. 1089
  10. 396
  11. 297
  12. 1089
  13. 1089
  14. 1089
  15. 396
  16. 1089
  17. 198
  18. 1089
  19. 1089
  20. 792
  21. 693
  22. 891
  23. 495
  24. 1089
  25. 693
  26. 198
  27. 1089
  28. 297
  29. 1089
  30. 792
  31. 693
  32. 297
  33. 1089
  34. 297
  35. 1089
  36. 1089
  37. 1089
  38. 1089
  39. 1089
  40. 1089

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