Coding Projects on a Maths Personal Statement?

Just wondering, I'm looking at a Maths degree and am very passionate about its usages within Computer Science (I did ponder on CS but I dislike the theory, still not sure whether that's the right choice).
In short though, I've been doing some projects like visualizing Lagrange Polynomials and such. I thought this might be a good thing to put on a PS because it shows that I've done more research and have applied it?

Not sure if it's just better to write about books and MOOCs though, as obviously doing Maths the coding bit might dilute my message?

Thanks for any advice!

Pure maths or maths + CS?

Just pure, sorry if I wasn't clear. Did ponder on both but most unis I've looked at don't seem to offer it as a Joint oddly. Hence why I wondered whether having a coding project would be a good idea: obviously it shows passion but not sure if that's diluted. Thanks!