Hello all. I'm having a horrible time studying binary numbers I already know the following

1+0=1

0+1=1

0+0=0

1+1=10

which is all well and good but what happens when I get someting like this

1+1+1+1+1+1=?

The proffessor I believe thinks that we know this stuff already so he doesn't explain what to do in these situations

for instance we were doing some binary muliplication and I ended up with something like this

1011011

1010111

1011100

1010000

^ this column right here is what I'm having problems with what do I add what do I carry over to the next column. ArggggggggggggH. I've been working on this for like one day now and I haven't got a clue