1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 507 · 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 490. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Do the 1089 trick with 410: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Take 624. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.792 + 297 =
5. 5.Take 784. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
7. 7.594 + 495 =
8. 8.Do the 1089 trick with 774: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.198 + 891 =
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
11. 11.Do the 1089 trick with 840: reverse and subtract, then reverse that answer and add. What do you get?
12. 12.297 + 792 =
13. 13.396 + 693 =
14. 14.Take 921. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.Do the 1089 trick with 915: 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 1. What is that number?
17. 17.Take 107. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.Do the 1089 trick with 733: reverse and subtract, then reverse that answer and add. What do you get?
19. 19.Do the 1089 trick with 389: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.Do the 1089 trick with 359: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.Take 117. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 820: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.Do the 1089 trick with 441: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.Do the 1089 trick with 416: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
27. 27.Take 321. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.Do the 1089 trick with 430: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
30. 30.Do the 1089 trick with 287: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
32. 32.693 + 396 =
33. 33.Do the 1089 trick with 752: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Take 780. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
36. 36.Take 799. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Take 146. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.Take 862. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Take 517. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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