"Illustrative Mathematics provides guidance to states, assessment consortia, testing companies, and curriculum developers by illustrating the range and types of mathematical work that students experience in a faithful implementation of the Common Core State Standards, and by publishing other tools that support implementation of the standards."
How the Common Core is redefining math instruction Integrating skills throughout the curriculum, and drilling deeper on concepts, are among key changes. What does teaching math look like under the Common Core standards? Lots of classroom interaction and more inquiry-based approaches to learning, according to experts who are helping schools integrate the standards into instruction....more
*Some free, some paid. Some of the paid ones have free versions.
Note: Please feel free to add your own. If you feel that an app is in the wrong place or think one should be deleted, please make a notation before moving and/or deleting and I will check it. Thanks, -Mike
Models taken from P-5 NYS Common Core Implementation Guide for "A Story of Units"