1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 550 · 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 8. What is that number?
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
3. 3.Do the 1089 trick with 951: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.Do the 1089 trick with 436: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
6. 6.198 + 891 =
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 794: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Take 200. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.Do the 1089 trick with 365: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.297 + 792 =
12. 12.Do the 1089 trick with 371: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.Do the 1089 trick with 742: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.693 + 396 =
16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
17. 17.Do the 1089 trick with 421: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.Take 496. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Do the 1089 trick with 771: 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 6. What is that number?
21. 21.Take 991. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 660: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Take 992. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.Do the 1089 trick with 298: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.Do the 1089 trick with 420: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.Do the 1089 trick with 890: reverse and subtract, then reverse that answer and add. What do you get?
27. 27.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.495 + 594 =
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
30. 30.Take 803. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Do the 1089 trick with 450: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Do the 1089 trick with 934: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.Take 106. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Take 926. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.396 + 693 =
38. 38.Do the 1089 trick with 732: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Do the 1089 trick with 720: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?

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