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' work and formulate questions that will help them to improve.
The lesson begins with a whole-class discussion of the geometric diagram from the assessment task. Students then work collaboratively on the task, in pairs or threes, to produce a better collective solution than those they produced individually. Throughout their work they justify and explain their decisions to peers.
In the same small groups, students critique examples of other students' work.
In a whole-class discussion, students explain and evaluate the arguments they have seen and used.
Finally, students work alone on a new task similar to the original assessment task.