1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 520 · 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 117. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Take 698. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
5. 5.Take 870. Reverse its digits and take the smaller number away from the bigger one. 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
8. 8.Do the 1089 trick with 127: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Take 922. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.Take 812. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.Take 218. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Take 139. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.Take 701. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.Take 421. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.396 + 693 =
16. 16.Take 691. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
19. 19.495 + 594 =
20. 20.Take 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.Take 750. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Take 690. 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.Take 448. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.693 + 396 =
26. 26.Do the 1089 trick with 310: reverse and subtract, then reverse that answer and add. What do you get?
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
28. 28.Take 873. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Do the 1089 trick with 931: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
31. 31.297 + 792 =
32. 32.Do the 1089 trick with 711: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.Take 821. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
36. 36.Do the 1089 trick with 360: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.Take 713. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.Do the 1089 trick with 942: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.198 + 891 =

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