#Ratios

Ratios compare two quantities — 3 cups of flour to 1 cup of sugar, 60 miles to 1 hour, 2 boys to 3 girls in a class. They show up in cooking, mixing, scaling, mapping, and most of the math problems students meet in middle school. The posts collected under this tag walk through what a ratio is, how to simplify it, how to find equivalent ratios, what makes two ratios a proportion, and how cross-multiplication solves the proportion problems students see on every standardized test.