Seven picture books that each carry one real piece of mathematics. Pick the book whose concept you need this week and read it at whatever level your child or your class is actually working at. Fair sharing on a plate of twelve cookies. A pot that doubles whatever falls in. What a million would look like if you stacked it up. Polygons, one side at a time. A grain of rice that doubles for thirty days and buries a kingdom. A day where every single thing turns into a word problem. And a girl under the stars trying to get her arms around infinity. Every one of them names its concept clearly enough that you can plan a lesson from it, and any single one is worth the read-aloud on its own.
Here's the honest sorting, because it's the thing you actually need to know before you pick. Four of these are real stories that happen to carry mathematics: The Doorbell Rang, Two of Everything, One Grain of Rice, and Infinity and Me. You could read any of them to a child who has never heard the word 'concept' and they'd just be a good book, and the mathematics is load-bearing rather than decorative, which is exactly why it sticks. Two of them are lessons wearing a story's coat: The Greedy Triangle and How Much Is a Million?. Neither is worse for it. They're built by people who teach mathematics for a living and they deliver their idea cleanly in ten minutes, which is sometimes precisely what a Tuesday needs. Just don't expect anyone to ask for them again at bedtime. Math Curse is its own thing, a comedy about math class rather than a story or a lesson, and it's the one to hand the child who has decided the whole subject is out to get them. The other thing worth saying: the concept often lands older than the picture-book age band suggests. One Grain of Rice looks like a five-year-old's book and its idea is a fourth-grader's. Plan from the concept, not the pictures.