Do you ever wonder how to give students timely feedback on their understanding of math content? Do you wonder how confident students are with the material they are learning? Desmos is a great solution to both of these questions. During this session, I will discuss how I use Desmos in my classroom. I will show how I use the computation layer in Desmos to design “lock in your answer” questions as a way to assess student thinking. I will also show participants how students can self-assess their understanding of a concept using Desmos, and how teachers can quickly identify students who need extra support. Participants will walk away with formative assessment templates they can use in their own classrooms.