Here a list of math specific picture books that I have read and recommend. This is not a sponsored post, although if you purchase a book from Book Depository through a link on my page I'll get a tiny commission (at no cost to you!).
I plan to keep adding to the list as we read more!
Equal Schmequal by Virginia Knoll is an absolute favorite in our house at the moment. I love that this concept of equal is useful in all lots of situations from equal weights, to equal fractions to equal equations. Definitely a concept worth knowing well.
We have A Pair of Socks and It's About Time both by Stuart J Murphy. I'm eyeing off all his other books too (but I have a minimalist husband 😉). NB It's About Time has one page of scary shadows so if your child spooks easily may not be for you.
City Shapes by Diana Murray is a great jumping off point for doing your own shape walk, which in turn can lead to making city pictures out of shapes.
I really adore this vintage set by Ichiko Fuyuno which I've tracked down on Amazon:
I wish I had (Basic counting book)
How many? (Adding) I love this one, inspiring kids to add everyday objects.
Take it away, Greta (Subtracting) I love this one too, fun.
Pom-Pom's Birthday Party (counting by tens) A little more complex, needs instigating by parents to count by ten, but a cute story.
Blockhead: the Life of Fibonacci by Joseph D'Agnese introduces the idea of looking for patterns in nature, a near fictorial account of Fibonacci's life but great to get kids thinking about who mathematicians are.