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1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 385 · 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 1. What is that number?
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  3. 3.396 + 693 =
  4. 4.Take 824. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.Do the 1089 trick with 260: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  7. 7.Take 954. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.891 + 198 =
  9. 9.792 + 297 =
  10. 10.594 + 495 =
  11. 11.Take 480. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.Take 107. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.Do the 1089 trick with 398: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.Take 761. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Take 619. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.Take 620. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.Do the 1089 trick with 249: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.Do the 1089 trick with 638: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  23. 23.Do the 1089 trick with 913: reverse and subtract, then reverse that answer and add. What do you get?
  24. 24.Take 209. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.198 + 891 =
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  27. 27.Take 498. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.Take 987. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Take 188. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.Do the 1089 trick with 336: reverse and subtract, then reverse that answer and add. What do you get?
  31. 31.Do the 1089 trick with 780: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.Do the 1089 trick with 500: 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 8. What is that number?
  34. 34.Do the 1089 trick with 224: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.Do the 1089 trick with 624: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.Do the 1089 trick with 693: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.Do the 1089 trick with 870: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.693 + 396 =
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  40. 40.Do the 1089 trick with 420: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 198
  2. 693
  3. 1089
  4. 396
  5. 1089
  6. 396
  7. 495
  8. 1089
  9. 1089
  10. 1089
  11. 396
  12. 594
  13. 1089
  14. 594
  15. 297
  16. 891
  17. 792
  18. 1089
  19. 594
  20. 1089
  21. 1089
  22. 495
  23. 1089
  24. 693
  25. 1089
  26. 297
  27. 396
  28. 198
  29. 693
  30. 1089
  31. 1089
  32. 1089
  33. 891
  34. 1089
  35. 1089
  36. 1089
  37. 1089
  38. 1089
  39. 792
  40. 1089

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