Thanks! We do do this like counting cars or clothes. He is good at counting from 1-20 so I think we are going to move to the concept of adding/subtractions. Probably going to use fruits.
I personally think focusing on discrete math is a mistake, though everybody does it. Kids know the world is continuous* — just consider Piagetian experimentation in the bath — so opportunities to think that way are just as important, and I suspect more intuitive. The downside is my kid wanted to major in pure math.
* well, down to the Planck length I suppose :-)