1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 140 · 40 questions

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.

1. 1.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.297 + 792 =
3. 3.Do the 1089 trick with 470: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.Take 724. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Do the 1089 trick with 875: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.495 + 594 =
7. 7.Take 370. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.693 + 396 =
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
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 408: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.198 + 891 =
14. 14.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.891 + 198 =
16. 16.594 + 495 =
17. 17.Do the 1089 trick with 907: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.Do the 1089 trick with 108: 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 7. What is that number?
20. 20.Do the 1089 trick with 391: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 991: 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 3. What is that number?
24. 24.Take 511. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Do the 1089 trick with 629: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
27. 27.Take 400. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.Take 825. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Do the 1089 trick with 149: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.792 + 297 =
32. 32.Do the 1089 trick with 802: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.Take 309. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Take 843. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Take 971. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Take 298. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Do the 1089 trick with 710: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?

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