1089 Trick Worksheet

Maths tricks trick 7: The 1089 magic trick · Set 383 · 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 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Take 689. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.792 + 297 =
4. 4.594 + 495 =
5. 5.Take 229. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Take 826. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
8. 8.Do the 1089 trick with 781: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.Take 982. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.Take 521. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.Take 925. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.396 + 693 =
14. 14.Take 527. 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 6. What is that number?
16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
17. 17.Take 590. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.Do the 1089 trick with 119: reverse and subtract, then reverse that answer and add. What do you get?
19. 19.Do the 1089 trick with 860: 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.Do the 1089 trick with 490: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.Take 842. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.693 + 396 =
26. 26.Take 853. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.Take 966. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.Take 296. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
32. 32.297 + 792 =
33. 33.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.Do the 1089 trick with 469: reverse and subtract, then reverse that answer and add. What do you get?
35. 35.891 + 198 =
36. 36.Take 308. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.198 + 891 =
38. 38.Do the 1089 trick with 690: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Take 380. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.Do the 1089 trick with 791: reverse and subtract, then reverse that answer and add. What do you get?

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