The document discusses ratios, rates, and unit rates. It defines a ratio as a comparison of two quantities using division, and defines a rate as comparing quantities with different units of measure. It provides examples of writing ratios as part-to-part, part-to-whole, and whole-to-part. Equivalent ratios that represent the same comparison are also discussed. The document explains how to write rates by looking at price per unit. It gives an example of calculating a unit rate by dividing a total price by the number of liters to determine the cost per liter.

1. Ratios and Rates Monday, January 25, 2010