# 7. Use graphs with scales other than one (C)

teaches Common Core State Standards CCSS.Math.Content.3.MD.B.3 http://corestandards.org/Math/Content/3/MD/B/3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Understand that picture graphs and bar graphs can have scales other than one.

Students bring prior knowledge of displaying measurement data by making a picture graph and bar graph with a scale of one from 2.MD.10. This prior knowledge is extended to interpreting data on graphs with a scale other than one as students solve problems about favorite book genres. A conceptual challenge students may encounter is that one picture on a picture graph or unit on a bar graph may represent multiple objects.

The concept is developed through work with various graphs, which support the learning by showing visual relationships between data in different categories.

This work helps students deepen their understanding of equivalence because they must implement the concept of one picture or unit representing more than one object.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they explore patterns in skip-counting and operations to interpret data.

Key vocabulary:

• bar graph
• data
• graph
• interpret
• picture graph
• scale
• unit

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