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.
At the start of the lesson, students read your comments and consider ways to improve their work.
In pairs or threes, students work together to develop a better solution, producing a poster to show their conclusions and their reasoning.
Then, in the same small groups, students look at some sample student work showing different approaches to the problem. They evaluate the strategies used and seek to improve the arguments given.
In a whole-class discussion, students compare different solution methods.
Finally, students reflect individually on their learning.