Part-to-Part and Part-to-Whole Ratios

Grade 7•45 minutes•Standard 6.RP.1 Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities.

Learning Objective

I can identify and write part-to-whole and part-to-part ratios from real-world examples, such as the ratio of boys to girls in our class or the ratio of apples to total fruit in a basket.

Practice Questions

This lesson includes 2 practice questions to reinforce learning.

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1. In a class of 30 students, 12 students play a musical instrument. What is the part-to-whole ratio of students who play an instrument to the total number of students in the class? What is the part-to-part ratio of students who play an instrument to those who do not?

2. A bakery sells cookies and muffins. On a particular day, they sold 25 cookies and 15 muffins. What is the part-to-part ratio of cookies sold to muffins sold? What is the part-to-whole ratio of muffins sold to the total number of baked goods sold?

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