The Progression of Addition and Subtraction is a wildly discussed topic in elementary schools. It is important that we do not rush students’ understanding of the operations. Learning should be anchored in the foundational understanding of joining and separating situations, and then extended to other problem situations. It is imperative that students spend ample time modeling the operations using tools, base ten blocks etc. For more information on the Progression of Addition and Subtraction Check out this quick video!