In case you are trying the MARS MAP Classroom Challenges for the first time, it is recommended that you read the Brief Guide for teachers and administrators before you get started.
Before the lesson, students attempt the assessment task individually. You then review students' responses and formulate questions that will help them improve their work.
During the lesson, students work collaboratively in pairs or threes, matching equations to stories and then ordering the steps used to solve these equations. Throughout their work, students explain their reasoning to their peers.
Finally, students again work individually to review their work and attempt a second task, similar to the initial assessment task.