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: **