We've already had this conversation, haven't we?
As Buzz said, that's not Common Core. Common Core is not infecting your children's brains with radioactive liberalism. It's merely a set of national standards that allows for every state to strive to prepare their students for college and careers. The curriculum that is implemented is developed by the state, so if you don't like how that teacher is teaching math problems, take it up with your senator and state superintendent.