We love exploring with magnets - seeing what sticks and what doesn't, talking about why some metal things work and some don't, talking about why some things that don't seem metal (i.e. pipe cleaners) but still stick, etc.
This year we also added a little bit of math to our magnet fun. I cut up pipe cleaners into little pieces. Then, the girls tried to see how many they could get to stick on. After, we counted how many pipe cleaners were stuck to our magnet. It was good for practicing counting to high numbers.