Common Core Elementary Google Knowledge Base 
The Web20Classroom
AUGUST 24, 2015
Something that could adapt with the ever changing knowledge base educators and students could pull from along with being more personal. There are Flexbooks for middle school and even some for Elementary Math. All the content is Common Core aligned so you can be sure its high-quality and timely. Still true today!)
Edsurge
JULY 10, 2017
For example, imagine that you are an elementary school principal who is looking for opportunities to strengthen specific third grade math skills in the new school year. In doing so, you accentuate the strengths of individual teachers and expose other teachers to new styles and ideas in bite-sized chunks.
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