http://insidemathematics.org/index.php/common-core-standards - This website has many sample video lessons illustrating the Standards for Mathematical Practice for grades K-12. It also contains performance tasks and problems of the month aligned to the Common Core Math content standards.
www.learnzillion.com - LearnZillion is a free learning platform that combines video lessons, assessments, and progress reporting. Each lesson highlights a Common Core standard, in either Math or Language Arts.
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