To the Editor: Let the federal government lay down a far-reaching law, and there sometimes is little common ground between those having to administer the law and those affected by the law. Teachers, parents and students are struggling to make the mathematics Common Core standards in education work. There is good intent by educators on the standards and principles developed. The goals are commendable. There is unhappiness, though, with the huge changes in how students are taught. There have been two major missteps in made in the past.