1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 971 · 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 811: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Take 128. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Do the 1089 trick with 239: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
6. 6.Do the 1089 trick with 970: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
8. 8.Do the 1089 trick with 244: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Take 670. 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 8. What is that number?
11. 11.Take 361. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Do the 1089 trick with 981: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.Take 961. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
15. 15.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.297 + 792 =
17. 17.396 + 693 =
18. 18.792 + 297 =
19. 19.Do the 1089 trick with 980: 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 5. What is that number?
21. 21.Take 269. Reverse its digits and take the smaller number away from the bigger one. What do you get?
22. 22.Do the 1089 trick with 882: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.693 + 396 =
24. 24.Take 254. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.Take 547. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.495 + 594 =
28. 28.Take 753. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.Take 450. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Take 400. Reverse its digits and take the smaller number away from the bigger one. 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
34. 34.Do the 1089 trick with 391: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.Take 830. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Do the 1089 trick with 822: reverse and subtract, then reverse that answer and add. What do you get?
37. 37.Do the 1089 trick with 815: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.891 + 198 =
40. 40.Take 187. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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