# 7. Apply Conversions of Customary Measurement (A)

teaches Common Core State Standards CCSS.Math.Content.4.MD.A.1 http://corestandards.org/Math/Content/4/MD/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Convert customary units of length using a double number line.

This lesson provides an opportunity for students to apply their knowledge and understanding of converting units of measure to a mathematical situation. Students are asked to decide which vehicles can fit on a ferry when the measurement of the vehicles is in yards, but the requirements for fitting on the ferry are given in feet.

Key Concept students will use:

• Multiplication can be used to convert larger units of measure to smaller units of measure.

Skills students will use:

• Multiplication of whole numbers

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they reason that if an object is 15 yards long and there are 3 feet in 1 yard, then the object is also 45 feet long.

Key vocabulary:

• feet
• yard

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