Here are two other videos on, and includes the resources used for, the instructional routine Contemplate then Calculate from a workshop setting. We recommend watching the video all of the way through and recording notes or questions as you do so.
Here is the task for this particular enactment of Contemplate then Calculate.
Here is a link to the slides used for this task.
Here are the resources for using this task, including the slides, pre-planner, lesson plan, and printable posters.