This lesson offers teachers the opportunity to listen to ways in which students reason about multi-digit multiplication. After the Warm-up, students create their own Estimation Exploration activity and then facilitate their Estimation Exploration with other students in the class. Students can draw pictures or find images to use from books or other sources or use actual objects from around the classroom, as the teacher determines.

Think about who volunteered to share their thinking with the class today. Are the same students always volunteering, while some students never offer to share? What can you do to help the class understand the value of hearing the ideas of every mathematician in the classroom?