The Math and Literature series by Marilyn Burns is one of my favorite math teaching tools. The book suggests books and lessons that tie math and story together. Kids come up with al kinds of ideas to explain because they have such an unstructured way to respond to the math prompt. The story form gets kids who often get stuck a different way to think about math concepts.
This lesson was all about how to equally share cookies based on an event from Little House in the Big Woods.