There are many, many great math picture books for kids out there. They range from including puzzles and games to telling stories to teach a bit of math to your delighted child.
My favorite math picture books are the ones that tell the story of a mathematician and how he derived a principle or relationship. Two of the better ones available are “The Librarian Who Measured The Earth” by Kathryn Lasky (yes, of Guardians Of Ga’hoole fame),
and “Blockhead – The Life of Fibonacchi” by Joseph D’Agnese
My kids enjoyed these stories long before they understood the mathematics behind the tales, and they enjoy them still today.