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Math at the Core: Middle School is a collection of hundreds of free resources for math students in fifth through eighth grades. Most of these resources are short videos that explain a variety of mathematical concepts. The collection also includes infographics, interactive features, links to outside resources, and more. Math educators and tutors can browse the collection by grade level or by Common Core domains. Common Core domains include operations and algebraic thinking, the number system, geometry, statistics & probability, and more.

James Stanton, a mathematician, describes his site like this: On this site I present a whole host of curriculum essays, more general mathematical essays, and puzzlers. I offer books that cover the content of the high school curriculum in a joyful and accessible way (with no sacrifice to rigor) respectful of the beauty and wondrous creative nature of mathematics. I show how even high-school mathematics can surprise and delight, and how clean and uncluttered key topics can be.