Picture Books reinforcing math concepts MathStart Series

I am thinnking of buying some picture books a saw in amazon that reinforce simple math concepts. I will start with 1st and 2nd level.
i hope it is worth bcause not only we will do some math but also do some reading and in english.

Is there anyone that has seen or work with them with your kid?
The link to see it is:
http://www.amazon.com/gp/product/0064467163/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER#productPromotions