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May 2, 2013
Ratios and Proportional Relationships
3. Use ratio and rate reasoning to solve real-world mathematical problems, eg. by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations.
a. Make tables of equivalent ratios relating quantities with whole number measurements, find missing values in the tables, and plot the pairs of values on the coordinate plane. Use tables to compare ratios.
Do you think they mean take equivalent ratios like 1/2, 2/4, 3/6 etc and present them in a T-chart like
1 2 2 4 3 6
like we do when we are starting to talk about linear equations? So it's really turning the ratio into an ordered pair, or a dep and ind variable? What else does it mean? Tape diagrams? Double number lines?
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When I teach "slope" in 8th grade in the Common Core...it is taught in the ratio unit and while I don't have the stuff in front of me...I saw it before I taught it this year and did it the common core way instead of the way I was taught to do it and I thought it made much more sense to the kids...