Matrix multiplication October 24, 2012Posted by mareserinitatis in math, older son, teaching.
Tags: math, matrix, older son
The older boy was working on matrix multiplication in math. He got very testy with me: “Why do I even need to know this?” I replied that it’s used all the time in calculus-based physics. That disappointed him as he would like to take it some day.
He was super frustrated because the explanation on the computer was very…verbal. Unfortunately, I couldn’t locate my favorite linear algebra book, so I tried to go through and explain it while making some diagrams.
He still had some problems and then kept asking if they were somehow related to Punnet squares. Um…not really.
And then he made this diagram.
I have to admit that it’s not how I would think to multiply matrices…or at least I think there are easier representations. (In my mind, at least.) However, this did work in that it made sense to him, and once he had figured out enough to draw this, he was able to finish the rest of the problems on this concept.
This just goes to show that we don’t all think the same way, I suppose. The way we think about things may not always be the easiest for someone else.