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Recall what a ratio is Mr. H's Math World Finding and Comparing Unit Rates Nov 178:02 AM Example: Nov 178:50 AM 1 What Is a rate? What is a unit rate? A rate is a ratio that compares two different quantities with different units A unit rate is a rate where the denominator of the fraction is equal to 1. Examples: example: example: Nov 178:47 AM Nov 178:57 AM 2 Using Unit Rates to Make Comparisions A primary use of unit rates is to make comparisons between 2 or more ratios Using Unit Rates to Make Comparisions example: example: Nov 179:36 AM Nov 1712:10 PM 3 Using Unit Rates to Make Comparisions Using Unit Rates to Make Comparisions A millimeter (ml) is defined to be 1 cm3 or 1 cubic centimeter. The density of a substance is a unit rate often expressed as g/cm3. The density is the mass of a substance per unit volume. example: Example: Nov 179:53 PM Nov 228:33 PM 4