For five years, a San Francisco foundation funded, and a research organization closely monitored, a collaboration by 10 California districts to raise achievement under the Common Core math standards.

This story was produced by the Hechinger Report, a nonprofit, independent news organization focused on inequality and innovation in education. Read more about the Common Core. SAN ANTONIO—Karen Demore ...

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The Hechinger Report covers one topic: education. Sign up for our newsletters to have stories delivered to your inbox. Consider becoming a member to support our nonprofit journalism. SAN ANTONIO — ...