1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 300 · 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.Do the 1089 trick with 802: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.297 + 792 =
3. 3.Take 813. 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 5. What is that number?
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
6. 6.Take 380. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.Do the 1089 trick with 179: reverse and subtract, then reverse that answer and add. What do you get?
8. 8.Do the 1089 trick with 401: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
10. 10.Take 882. 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 6. What is that number?
12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
13. 13.891 + 198 =
14. 14.Take 275. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.Do the 1089 trick with 296: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.Do the 1089 trick with 259: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.Take 765. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.396 + 693 =
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
23. 23.Take 956. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.Do the 1089 trick with 387: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.Do the 1089 trick with 885: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.Do the 1089 trick with 287: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.Take 189. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Take 492. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.792 + 297 =
33. 33.Do the 1089 trick with 107: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Take 329. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Do the 1089 trick with 340: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Take 783. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Do the 1089 trick with 188: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.Do the 1089 trick with 370: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.495 + 594 =
40. 40.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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