1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 920 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
2. 2.Take 813. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.Do the 1089 trick with 200: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
5. 5.Take 851. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Do the 1089 trick with 892: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.495 + 594 =
9. 9.Do the 1089 trick with 137: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
11. 11.396 + 693 =
12. 12.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
14. 14.Do the 1089 trick with 198: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.Take 993. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.Take 209. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Do the 1089 trick with 109: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.891 + 198 =
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
22. 22.Take 640. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.Take 997. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.792 + 297 =
25. 25.Take 784. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.198 + 891 =
27. 27.Do the 1089 trick with 721: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.Do the 1089 trick with 237: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.Do the 1089 trick with 803: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.Take 502. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.693 + 396 =
33. 33.297 + 792 =
34. 34.594 + 495 =
35. 35.Do the 1089 trick with 520: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Take 710. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Take 127. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Take 447. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
40. 40.Do the 1089 trick with 933: reverse and subtract, then reverse that answer and add. What do you get?

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