Open Up Resources, a nonprofit provider of openly licensed curricula for K-12 schools, has released a problem-based mathematics core curriculum for middle-school students that develops math thinking skills through questioning, discussion and real-world contexts.
The Illustrative Mathematics 
Open Up Resources, a nonprofit provider of openly licensed curricula for K-12 schools, has released a problem-based mathematics core curriculum for middle-school students that develops math thinking skills through questioning, discussion and real-world contexts.
The Illustrative Mathematics 6-8 curriculum is available for free to school districts. It has been published as an open educational resource (OER) under a Creative Commons License, which enables the free distribution of an otherwise copyrighted work. The program is available in both digital and print formats at im.openupresources.org.
Illustrative Mathematics is a nonprofit community of educators dedicated to improving mathemat