My daughter is starting to read her numbers now and it is so much fun watching her mind work. Now that she knows what the second number should be like 23 (say "twenty three") and 35 (say "thirty five") she reads her teens like this: 13 (says "three teen") and 15 (says "five teen"). It was so cute when she did it, it made me know that she could really read and reason. We're working out the kinks but she is really comprehending which gives me inspiration that I can really do this home-school thing.
My favorite counting books so far are:
Feast for 10
The story chronicles a trip to the grocery store and preparation of a family feast. Of course I love the Black family as subjects, but I really like the verses like "six bunches of greens".
Chicka Chicka 1-2-3
I love rhyming books for this stage of learning and the book goes all the way to 100 and counts by 10's. It teaches a lot and there are no talking animals to confuse the children either.