Model math standards produced by conservative education advocates helped spark a battle in South Dakota that could spread to other states.

Add Yahoo as a preferred source to see more of our stories on Google. Fifteen years after the calamitous rollout of the Common Core math standards, the once-derided strategy has proven its staying ...

Fifteen years after the calamitous rollout of the Common Core math standards, the once-derided strategy has proven its staying power, with many states holding onto the original plan or some close ...