Understand ratio concepts and use ratio reasoning to solve problems. Understand the concept of a unit rate a/b associated with a ratio a:b with b ≠ 0 (b not equal to zero), 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.)
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Should people with small feet pay less for shoes? Students calculate the cost per ounce for different sizes of Nike shoes, and use proportions to find out what would happen if Nike charged by weight.
In this activity students do a little comparison shopping as they determine which size Goldfish product is the best deal. Students are introduced to the ratio table as a tool for determining equiv...