Hi guys, I'm learning to code and so I chose javascript because of it's simplicity. I've been at it for some months now, so I decided to try out my new skills with a simple calculator project. I thought it would be easy, and it was, to a point. After running some tests, I found out that the add(), subtract(), multiply(), and divide() methods work only partially and the last one, doesn't work at all.

I think I'm doing this right, but I don't know, you tell me.

The Calculator.zip