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It is not homework since I am just brushing up =) but I will try posting it here.

I have the following base 14 subtraction problem:

35 - AB = ?

I can look up the answer, which is shown as 68 (base 14).

But, for the life of my, I can figure it out...

The problem I am having is that AB appears to be larger (?) than the 35?

How do I subtract a larger number, from a smaller, and not end up with a negative number?

I can figure out the first digit (8).

Since B is larger, we gotta carry over from the 3A column, and we end up with 14+5 (=19) - B (=11), so we end up with 8.

I get confused in handling the other column, which should now read 3 minus A (and the carried over 1).

How does that turn into six?

thank you.