1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 105 · 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. 1.297 + 792 =
2. 2.Do the 1089 trick with 702: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Take 651. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Do the 1089 trick with 368: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.693 + 396 =
7. 7.Take 410. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.Do the 1089 trick with 793: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
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 6. What is that number?
13. 13.Take 158. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
16. 16.Take 416. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.Take 996. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Take 189. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
23. 23.Do the 1089 trick with 216: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.Take 407. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Do the 1089 trick with 146: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.396 + 693 =
28. 28.594 + 495 =
29. 29.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.Take 664. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Take 470. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.Take 440. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.Take 115. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Do the 1089 trick with 820: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.Take 851. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Take 278. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Do the 1089 trick with 412: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
40. 40.Take 952. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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