This video features a first/second grade lesson designed to support students as they explore how use diagrams to identify what operation to use to solve a problem. Students share different strategies and engage in a classroom discussion that surfaces how students can use a diagram to write other math sentences they can solve more easily (e.g., transforming an addition sentence into an equivalent subtraction sentence

A document outlining the background and research on the content and standards, unit/lesson goals, and unit/lesson plan accompanies the video.