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Common Core Teaching Resources

CCSS.MATH.CONTENT.4.MD.C.7

In Grade 4 Standards for Mathematical Practice Measurement & Data Geometric measurement: understand concepts of angle and measure angles
Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.