RP Standard #2 (6.RP.2)

2. Understand the concept of a unit rate a/associated with a ratio a:b with≠ 0, and use rate language in the context of a ratio relationship. For example, “This recipe has a ratio of 3 cups of flour to 4 cups of sugar, so there is 3/4 cup of flour for each cup of sugar.” “We paid $75 for 15 hamburgers, which is a rate of $5 per hamburger.” [Expectations for unit rates in this grade are limited to non-complex fractions.]