Hi, my name is Tricia Whitty, I have been a fourth grade math teacher for 10 years, and I have created a collection of daily calendar supplements to address the Common Core math standards in a fourth grade classroom. Students need a daily practice of standards to reach mastery. This lesson is a quick daily revisit of prime and composite numbers, factors and multiples. The visual reminder is posted in the classroom for a constant reminder of this vital concept. Arrays which connect to multiplication and division is a tool that can reach into many strands as well as the standards addressed in the activity.