In this program, learn about addition and subtraction equations. Common Core 1st Grade requirements on this subject are introduced, beginning with a review of the symbols for addition, subtraction and equal to. How do we know if equations are true? What are the Commutative and Associative Properties of Addition? The answers to these questions are covered in depth with detailed graphics, diagrams and exciting video. On-screen, multiple-choice reviews at the end of each segment reinforce important concepts and make learning fun.