This lesson is optional because it is an opportunity for extra practice that not all classes may need. First, students learn Stage 1 of the Jump the Line center. In this new center, students take turns making strategic choices about numbers to add or subtract in order to reach target numbers. Then students can continue working on Jump the Line or choose between two previously introduced centers focused on addition and subtraction.

Think about times when students were able to make connections to and build on the ideas of their peers during discussions in this unit. What norms or routines allowed students to engage with other students’ ideas respectfully?