Common Core Sheets 

Measurement and Data 
Geometric measurement: understand concepts of angle and measure angles. 
7. Recognize angle measure as additive. When an angle is decomposed into nonoverlapping 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. 
Example (Hover to Enlarge) 
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Finding Missing Angle 4md7
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Each worksheet has 12 problems finding the missing angle.
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