OCTAL SUBTRACTION

Since we can't subtract 0 by 6, we have to borrow from 2. Subtract 1 from 2 and add 8 to 0. We're adding 8 because we're dealing with OCTAL number systems. So if we were to do this in DECIMAL, we add 10; HEXADECIMAL we add 16. This is actually what happens no matter what number system you're dealing with.

So, subtract 6 from 8 to get 2.

We can't subtract 3 from 1 so we borrow 1 from 1 making the 3rd digit zero. Now we add 8 to 1 to have 9.

Subtract 3 from 9 to get 6. The final answer is 62.