a.k.a. Binary for dummies
This post is based on a NaBloPoMo prompt: Tell us one thing you remember learning in school as a kid.
One thing I remember fondly is learning to do grid drawings. Our teacher would give us an empty grid with the same number of rows and columns (either a multiple of 10 or a power of 2, e.g. 10×10 or 16×16) and one sequence of ones and zeros per row.