Clip 19/43: Standard 6: Attend to Precision Using Decimals Part 2E
Overview
Mathematically proficient students.…are careful about specifying units of measure.…They calculate accurately and efficiently, express numerical answers with a degree of precision appropriate for the problem context.
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), standard 6 (attend to precision) and standard 7 (look for and make use of structure).