# Decompose Angles using Pattern Blocks

Videos to help Grade 4 students learn how to decompose angles using pattern blocks.

Common Core Standards: 4.MD.7

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Lessons for Grade 4
Common Core For Grade 4
## New York State Common Core Math Module 4, Grade 4, Lesson 9

NYS Math Module 4 Grade 4 Lesson 9 Concept Development
Problem 1: Derive the angle measures of an equilateral triangle.

Place squares around a central point. Fit them like puzzle
pieces. Point to the central point. How many right angles
meet at this central Point Y?

How many quarter-turns are there around the central point?

Arrange a set of green triangles around a central point. How
many triangles did you fit around the central point?