Learning Goal
Part of: Geometric measurement: understand concepts of angle and measure angles — 3 of 3 cluster items
Recognize angle measure as additive
**4.MD.C.7**: 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.
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4.MD.C.7: 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.
What you'll learn
- Explain that when an angle is decomposed into non-overlapping parts, the angle measure of the whole equals the sum of the angle measures of the parts
- Decompose a given angle into two or more non-overlapping smaller angles and write an addition equation relating the part measures to the whole measure
- Write and solve addition and subtraction equations with a symbol for an unknown angle measure, using a diagram as the source of information
- Apply the additive property of angle measure to find unknown angles in real-world and mathematical contexts, including angles on a straight line (180°) and angles around a point (360°)
- Verify solutions by checking that the computed part measures sum to the known whole measure
Slides
Interactive presentations perfect for visual learners • In development
Slides
In development
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