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By Matt Collette

Cheryl Schafer was a veteran math teacher by the time Common Core arrived in New York back in 2010. It was apparent to her almost immediately that teachers didn’t have the materials they needed to teach to the new national standards.

Take a middle school staple like the Pythagorean Theorem: “One text series had it as a sixth grade unit, one had it at eighth grade, and the Common Core wanted us to teach it in seventh grade,” Schafer recalled. “So it didn’t matter what you were using: there was disagreement all over the place.”

In response to the new standards, textbook publishers touted new editions they said were aligned to the Common Core. But nearly all of them were just repackaged versions of earlier books.

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