Books are a wonderful way to share math. Below are websites where you can learn more about sharing math with picture books and books.

1. My blog www.mathbookmagic.com has posts on picture books we find magical. Here are the covers of some of those books.

2. Erikson Early Math Collaborative  is a wonderful resource for early math educators. They regular post about math books they recommend on their website. A good one to follow on twitter @eriksonmath.

3. MathThroughStories.org is an amazing resource with lists of math books by topic, lesson ideas,  research articles and more!  If you are a looking for Bunch of math picture books on a particular topic, this is the place to go! Follow them on twitter @MathsStories. 

4. Mathical Book list (pdf of Award list and Honors 2015-2019): The Mathical Book Prize aims to inspire a love of mathematics in the everyday world in children of all ages.  These titles are as varied as the intersection between literature and mathematics — that is to say, they encompass picture books, novels, poetry collections, puzzle books, biographies, and more! The Mathical selection panel is drawn from librarians, teachers, mathematicians, early childhood experts, and others. The jury selects winners in five grade-level categories: PreK, K-2, 3-5, 6-8, and 9-12. The Mathical Book Prize is awarded by the Mathematical Sciences Research Institute (MSRI) in Berkeley, California.Here is a pdf of books that have won the Mathical award here.