This is a thinking task designed with 7th graders in mind for teachers using a Building Thinking Classrooms (BTC) model. The task itself is low-floor, so students can not solve using an algorithm. Instead, they must work within their groups to use perseverance, rigor, and collaboration to finish the task. Before your lesson, simply print and post the Whiteboard Poster of the task on all your whiteboards. This resource also has a Whiteboard Poster which includes 7 extensions for your students to