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5 votes
Solve, explain why the algorithm works
3892
-2567

1 Answer

6 votes
Unfortunately, you don't share enough info here for the question to make sense.

If I assume that you want to subtract 2567 from 3892, I'd write the problem in a slightly different manner:

3892
-2567
--------

Now subtract. Borrow 1 from 9 to obtain a 12, and then subtract 7 from 12, obtaining 5. Result: 1825. Is this correct? You could check by adding 1825 to 2567. You are correct if their sum is 3892.
User Samuel Martins
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