The last couple of weeks we have been working on multiples and this led us to "discover" prime numbers. He seems to be interested and has been making some interesting observations on the topic: "I love 2 because it has so many multiples", "prime numbers are like blue, which you can mix with red and get purple".
It sounds like he would have fun with the book
You Can Count On Monsters at this point in his development. My kids have both been excited about different aspects of it from his age up through the end of elementary school.
