1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 898 · 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. 1.891 + 198 =
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
3. 3.Take 700. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Take 196. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Take 105. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Do the 1089 trick with 199: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
8. 8.Do the 1089 trick with 470: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Do the 1089 trick with 315: 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.Take 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.Take 623. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.594 + 495 =
15. 15.297 + 792 =
16. 16.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
18. 18.Take 682. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Take 487. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.693 + 396 =
21. 21.Take 833. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
24. 24.Take 520. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Take 390. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.Take 461. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
29. 29.Take 730. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Do the 1089 trick with 370: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Do the 1089 trick with 108: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.Do the 1089 trick with 456: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Do the 1089 trick with 359: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.396 + 693 =
37. 37.Take 428. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.198 + 891 =
39. 39.Take 199. 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 8. What is that number?

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