Comment by bspammer

I highly recommend watching this video, which explains floats in the context of Mario 64: https://www.youtube.com/watch?v=9hdFG2GcNuA

Games are a great way to explain floats because they're so visual. Specifically, check out 3:31, where the game has been hacked so that the possible float values in one of the movement directions is quite coarse.

(If you're curious what a PU is, and would like some completely useless knowledge, this video is also an absolute classic and very entertaining: https://www.youtube.com/watch?v=kpk2tdsPh0A)