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 should work individually on an assessment task designed to help you understand their current levels of understanding and difficulties. You review their responses and write questions to help them improve their work.
After a whole-class introduction, students work together in small groups on a card-matching task. In the same small groups, they then create directed number calculations to correspond to temperature changes or city temperatures. To end the lesson there is a whole-class discussion.
In a follow-up session, students again work alone on task similar to the assessment task.
To help you assess how well students are able to understand and use directed numbers in context. It is intended to help identify and aid students who have difficulties in ordering, comparing, adding, and subtracting positive and negative integers. Particular attention is paid to the use of negative numbers on number lines to explore the structures: starting temperature + change in temperature = final temperature final temperature - change in temperature = starting temperature final temperature - starting temperature = change in temperature