Lesson plan

# 2. Identify fractional lengths on a number line and ruler (FP)

teaches Common Core State Standards CCSS.Math.Content.3.MD.B.4 http://corestandards.org/Math/Content/3/MD/B/4
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Measure fractional lengths on number lines and rulers.

This lesson helps to build procedural skill with identifying unit fractions on a number line (and ruler). The partitioning of number lines and rulers is used here to introduce the idea that fractional lengths are invariant. This work develops students' understanding that a length does not change if its position on a number line or ruler changes.

Students engage in Mathematical Practice 5 (use appropriate tools strategically) as they measure fractional lengths on both number lines and rulers.

Key vocabulary:

• align
• length
• number line
• partition
• ruler
• unit
• unit fraction