Learning Goal
Recognize angle measure as additive
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
- Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
- Guided Notes →One page your students fill in and keep.
- Exit Ticket →Three items at the end of class. No student accounts.
- Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
- Homework →Assign practice; it grades itself.
**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 degrees) and angles around a point (360 degrees)
- Verify solutions by checking that the computed part measures sum to the known whole measure
Slides
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Recognizing angle measure as additive
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