Unit 5, Lesson 8# Relate manipulative representations to the addition algorithm

EngageNY 60 min(s)

In this lesson, students continue to build their conceptual understanding of adding numbers within 1,000. They relate the use of place-value disks on a place-value chart to the algorithm, recording compositions as new groups below in vertical form. As they move the manipulatives, students use place-value language to express the action and physically exchange 10 ones for 1 ten and 10 tens for 1 hundred, if necessary. They record each change in the vertical form, step by step.