Lesson

# Clip 15/21: Standard 7: Look for & Make Use of Structure Using Decimals Part 2E

## Overview

Mathematically proficient students….can see complicated things…as single objects or as being composed of several objects.

Erika Isomura’s 5th-grade students continue to work in pairs to classify, sort, and glue down decimal representations in numerical order. Erika invites her students to compare their work to their work for prior investigations and other problems. She reminds each partner to contribute equally to the pair work. She asks “How did you get that? Can you show it to me in a picture or with numbers?” She challenges partners to contribute to their pair’s mutual work: “Make sure he's proving it to you. Don't just let him talk it out.” As partners finish their work, Erika invites them to do a “gallery walk” of other partners’ work to check and compare their work. This clip also relates to standard 1 (make sense of problems and persevere in solving them), standard 3 (construct viable arguments & critique the reasoning of others) and standard 6 (attend to precision).

See this video in the context of an entire lesson.