# 5. Explore additive angles with pattern blocks (FP)

teaches Common Core State Standards CCSS.Math.Content.4.MD.C.7 http://corestandards.org/Math/Content/4/MD/C/7
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Compose and decompose angles.

This lesson helps to build fluency with composing and decomposing angles. Pattern blocks are used here because it highlights the composition of a cirlce with multiple angles.  This work develops students' understanding that angles can be composed and decomposed.

Students engage in Mathematical Practice 4 (model with mathematics) as they use pattern blocks to decompose angles by starting off with concrete examples. Students see that the measures of all of the angles at a point, with no overlaps or gaps, add up to 360°, and they use this fact to find the measure of the pattern blocks’ angles.

Key vocabulary:

• acute
• angle
• compose
• decompose
• degrees
• obtuse
• right
• straight angle

Special materials needed:

• pattern blocks
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