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Common Core Mathematics 6-8 
 ClusterUnderstand ratio concepts and use ratio reasoning to solve problems.
TopicRatios and Proportional Relationships
   Grade 6
  6.RP.2.Understand the concept of a unit rate a/b associated with a ratio a:b with b ‚ 0, and use rate language in the context of a ratio relationship. For example, gThis 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.h gWe paid $75 for 15 hamburgers, which is a rate of $5 per hamburger.h[1Expectations for unit rates in this grade are limited to non-complex fractions].