Lesson 10

The purpose of this lesson is for students to analyze different kinds of estimation problems and ways to make estimates, and then write their own estimation problems.

Earlier in the course, students developed their ability to reason multiplicatively and to find products of multi-digit numbers. Throughout the course, students have also been prompted to make estimates. In this lesson, they apply these understandings and skills to create their own Estimation Exploration activity.

The Estimation Exploration routine encourages students to anticipate multiple ways others might make an estimate based on a given image or description, and to revise their thinking accordingly. Later in the lesson, students will facilitate their activity in small groups. The lesson may take more than one class period if students take turns facilitating their estimation problem.

• Gather two magazines or other sources of images for each group of 3–4 students.

Today’s lesson invited students to contribute in different ways and settings. Reflect on who participated in math class today. What assumptions are you making about those who did not participate? How can you leverage each of your student’s ideas to support them in being seen and heard in tomorrow’s math class?