The National Council of teachers of Mathematics provides Core Math Tools, a downloadable suite of interactive software tools for algebra and functions, geometry and trigonometry, and statistics and probability. The tools are appropriate for use with any high school mathematics curriculum and compatible with the Common Core State Standards for Mathematics in terms of content and mathematical practices. Java required.
Figure This! is a resource from the National Council of Teachers of Mathematics that provides interesting math challenges that middle-school students can do at home with their families.
Illuminations provides standards-based resources and materials that illuminate the vision of National Council of Teachers of Mathematics for school mathematics and improve the teaching and learning of mathematics for each and every student. Lessons and activities on Illuminations can be searched by grade level and broad mathematics area.
Learning Trajectories is a program based at the University of Denver. They provide activities that guide children through successive levels of development in their mathematical thinking.
A brief introduction to STEM learning resources from Bright Horizons. This is a good starting place for ideas.
This website is provided by WGBH and partner organizations. It features curriculum ideas, teaching strategies, and resources for home visiting organizations.
PEEP and the Big Wide World is a website provided by WGBH and partner organizations. The site features resources for parents and families to enjoy science and math activities at home.
Seeds of STEM is a website provided by Worcester Polytechnic Institute featuring a STEM curriculum and teacher resources for pre-school STEM education.