1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 571 · 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. 1.198 + 891 =
2. 2.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Do the 1089 trick with 880: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.Do the 1089 trick with 652: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.693 + 396 =
7. 7.Take 491. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.Take 518. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.Do the 1089 trick with 139: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.Take 745. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
13. 13.594 + 495 =
14. 14.Take 911. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.Do the 1089 trick with 103: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
17. 17.Take 450. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.297 + 792 =
19. 19.Do the 1089 trick with 843: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
21. 21.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 254: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Do the 1089 trick with 427: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
25. 25.396 + 693 =
26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
27. 27.Take 612. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.Do the 1089 trick with 138: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.Take 790. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Take 834. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Do the 1089 trick with 124: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Take 489. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.792 + 297 =
34. 34.Take 792. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Take 511. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.891 + 198 =
37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
39. 39.Take 299. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Do the 1089 trick with 146: reverse and subtract, then reverse that answer and add. What do you get?

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