1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 997 · 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.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.396 + 693 =
3. 3.Take 148. 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 6. What is that number?
5. 5.Take 810. 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 7. What is that number?
7. 7.Do the 1089 trick with 622: reverse and subtract, then reverse that answer and add. What do you get?
8. 8.Do the 1089 trick with 950: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Do the 1089 trick with 663: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.Do the 1089 trick with 163: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.Take 739. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Do the 1089 trick with 780: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.891 + 198 =
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
15. 15.Do the 1089 trick with 164: 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 4. What is that number?
17. 17.Do the 1089 trick with 249: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.Do the 1089 trick with 795: reverse and subtract, then reverse that answer and add. What do you get?
19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
20. 20.297 + 792 =
21. 21.Do the 1089 trick with 962: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.Do the 1089 trick with 830: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.495 + 594 =
25. 25.Take 123. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 832. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.594 + 495 =
28. 28.Take 427. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Take 105. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Take 971. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.Do the 1089 trick with 890: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Do the 1089 trick with 510: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.792 + 297 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
36. 36.198 + 891 =
37. 37.Take 316. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Do the 1089 trick with 630: 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 2. What is that number?
40. 40.Do the 1089 trick with 255: reverse and subtract, then reverse that answer and add. What do you get?

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