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A collection of statistical data sets from the National Council of Teachers of Mathematics.  Perfect for teaching Common Core Standards related to data analysis.   Use the free NCTM data analysis or spreadsheet app to work with the data.   

From @NCTM, these math challenges are designed to bring mathematical thinking to the dinner table for families.  Teachers will also find many of these problems valuable to tackle with students to support problem solving skills and mathematical practices.  The challenges are also available in Spanish.

A collection of FREE mobile apps from the National Council of Teachers of Mathematics.  Available for IOS and Android.

From the National Council of Teachers of Mathematics, a suite of "Core Math Tools," digital tools that can be used by students to model math problems for algebra and functions, geometry and trigonometry, and statistics and probability. These tools can be downloaded and run on any computer, but will not work on mobile devices.

Create geometric figures easily to your specs.

This is a free, easy to navigate resource for Mathematics at all grade levels.