Common Core Standards a MUST have teacher app! Our district, like most, has made the move from state standards to common core statandards. Learning a new set of standards can be difficult, especially if you've taught from the same standards for a number of years. This easy to use app helps ease the transition putting all of the common core standards at your fingertips. It covers math and languge standards for grades k-12. This is an app I referred to weekly, sometimes daily, as I planned lesson and tried to understand these new standards.