WATCH: What Common Core Implementation Looks Like

While the 40-plus states that have adopted the Common Core State Standards agree what skills students should have at certain grade levels, the decision of how to teach the material is not prescribed. That is one of the reasons there has been uneven implementation across the country, and why some states are reconsidering the Common Core. Other states have pushed back dates when Common Core test results will be used in evaluating students, teachers and schools.