1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 842 · 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 780. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.792 + 297 =
3. 3.Do the 1089 trick with 164: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.Take 135. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Do the 1089 trick with 360: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
7. 7.Take 279. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.Do the 1089 trick with 220: 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 7. What is that number?
10. 10.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.Take 852. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Do the 1089 trick with 861: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.Do the 1089 trick with 209: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.891 + 198 =
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
16. 16.594 + 495 =
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
20. 20.Do the 1089 trick with 745: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.297 + 792 =
22. 22.Take 951. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.495 + 594 =
24. 24.Take 126. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Take 581. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 942. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.Take 944. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.396 + 693 =
29. 29.Do the 1089 trick with 136: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.Do the 1089 trick with 870: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Take 772. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.Take 916. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.Take 604. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Do the 1089 trick with 476: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.Take 865. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Take 590. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.Take 500. Reverse its digits and take the smaller number away from the bigger one. What do you get?
39. 39.198 + 891 =
40. 40.Take 419. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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