Clip 23/43: Standard 6: Attend to Precision Using Rates Part 2
Overview
Mathematically proficient students try to communicate precisely to others. They try to use clear definitions in discussion with others and in their own reasoning... They 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... By the time they reach high school they have learned to examine claims and make explicit use of definitions.
Joe Condon presents a lesson study for 6th grade students and observing teachers to identify strategies for comparing unit rates. In these clips, students are asked to name some familiar or common rates. Students then try to give their own definition of rate after looking at these examples. Finally students are given a ratio with no words and asked what it could mean.