Here my problem is same, via normal LR method….

1. 590 – 492 = 1_ _

2. In ten digit 90 – 92 = 0_

3. Now after borrow( for unit digit) 0 become 9(in ten digit)  and unit digit is 10-2 = 8

4. But how I change hundred digit 5 – 4 in zero.

chk ur solution, u didn’t mention how u make 1 to 0, u just make 9-9 = 0 in 9 after carry 1,
<figure>2. Subtracting the second two digits (9 – 9) we get 0.

590 – 492 = 1 0 _

3. We can’t subtract the last digits 0 and 2. So we borrow 1 from our answer 10, so the calculated digits change to 9.

590 – 492 = 9 _

4. Next we subtract 10 – 2 to get 8.

590 – 492 = 9 8</figure>