This document introduces ratios and rates. It defines a ratio as a comparison of two quantities by division that can be written in different ways. It provides an example of a ratio comparing the number of students with after-school jobs to those without from a survey. It defines a rate as a ratio that compares quantities in different units, using an example comparing prices and volumes of different sizes of dish detergent. It defines a unit rate as a rate with a denominator of 1, providing examples of unit prices, gas mileage, and speed. It includes homework problems involving writing ratios as fractions, identifying the lowest price based on a rate, calculating a unit rate, and converting between units of speed.
