1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 205 · 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 715. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.891 + 198 =
3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
4. 4.198 + 891 =
5. 5.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Take 205. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.495 + 594 =
8. 8.Take 851. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.Do the 1089 trick with 648: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
11. 11.Do the 1089 trick with 409: reverse and subtract, then reverse that answer and add. What do you get?
12. 12.Take 128. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.594 + 495 =
15. 15.Take 965. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.Do the 1089 trick with 179: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
18. 18.Take 699. Reverse its digits and take the smaller number away from the bigger one. What do you get?
19. 19.Do the 1089 trick with 398: 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 7. What is that number?
21. 21.Take 210. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 962: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.396 + 693 =
24. 24.Do the 1089 trick with 701: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.Take 299. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Do the 1089 trick with 602: reverse and subtract, then reverse that answer and add. What do you get?
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
28. 28.Do the 1089 trick with 720: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.Take 985. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Do the 1089 trick with 866: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.Take 982. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
34. 34.Take 638. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.297 + 792 =
36. 36.Do the 1089 trick with 421: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.Take 287. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Do the 1089 trick with 399: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Take 391. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Take 499. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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