Doing things at once

I think it is possible to do not just one thing at a time. But the problem is you won't be able to concentrate on the stuff you are doing. Take for example, I was attending my Engineering Mechanics subject. While my teacher is discussing a certain topic, I was talking to my seatmate. He saw me and ask me what he is talking about. I answered his question correctly. So that's an example of doing things at once. The problem with this is that I heard what my teacher is discussing but I can't clearly understand what he is discussing. Because I am so attached to the story of my seatmate.

Well I think that I can do several things at once I can talk on the phone and fix supper and do laundry. I usually have several things going at the same time as most mothers do