1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 873 · 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 741. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Do the 1089 trick with 762: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Take 309. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
5. 5.Do the 1089 trick with 350: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.693 + 396 =
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
8. 8.891 + 198 =
9. 9.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
11. 11.495 + 594 =
12. 12.Do the 1089 trick with 329: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.792 + 297 =
15. 15.297 + 792 =
16. 16.Take 720. 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 1. What is that number?
18. 18.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Do the 1089 trick with 208: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Take 917. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.594 + 495 =
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
26. 26.198 + 891 =
27. 27.Do the 1089 trick with 851: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.Take 762. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Do the 1089 trick with 522: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Do the 1089 trick with 510: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
33. 33.Do the 1089 trick with 430: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.Take 220. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Do the 1089 trick with 824: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.Do the 1089 trick with 420: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.Do the 1089 trick with 113: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.396 + 693 =
39. 39.Take 471. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Take 104. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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