The most useful college class I took was statistics, and I still find it useful. Here is a great exercise for your kids! Is this graph misleading in any way? See what they think. I'll just leave this here and if someone has questions, just ask! This skill is SO important given that almost all information is often presented in graph form (often to mislead). I'm sure you've seen this repeatedly in regards to politics. Click on image to see larger.
If you can't figure out how this graph is misleading, or you want to know if it even is, here is the answer!