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For high school mathematics teachers, the National Council of Teachers of Mathematics offers this collection of activities to help young mathematicians develop their quantitative reasoning skills. These activities have been developed by high school and college mathematics educators and can be downloaded in PDF format from this online library. Each PDF features a detailed teacher's guide as well as a student hand out. In one activity, "Cash or Gas?" students consider whether it is better to receive $250,000 in cash in an imagined lottery or free gas for life. Another activity, "As the Crow Flies," is designed to help students understand the logic and reasoning behind the Pythagorean theorem. These activities can be implemented alongside existing mathematics curriculum as they align with Common Core Standards.

Seeing Theory is a beautiful interactive website that aims to make statistics accessible to a wide range of students. The method? Interactive visualizations. The project brings to life fundamental concepts (Basic Probability, Compound Probability, Distributions, Statistical Inference, and Regression) covered in most introductory college or Advanced Placement (AP) statistics classes. Visualizations are broken down by categories and are accompanied by additional information about the method and data that they demonstrate.

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.