1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 539 · 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 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Take 421. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.792 + 297 =
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
5. 5.891 + 198 =
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
7. 7.Take 462. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
9. 9.297 + 792 =
10. 10.693 + 396 =
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
13. 13.Take 981. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.396 + 693 =
15. 15.594 + 495 =
16. 16.Take 963. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.Take 611. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.Take 289. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.Do the 1089 trick with 109: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.Do the 1089 trick with 619: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.Take 229. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Take 175. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.Do the 1089 trick with 753: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.Take 317. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Take 725. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
31. 31.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.Take 961. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.Take 710. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.495 + 594 =
37. 37.Do the 1089 trick with 470: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.Take 698. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.Do the 1089 trick with 830: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?

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