Teach your 4th grade students to determine unknown angles by solving addition and subtraction problems. Includes a download of the lesson and an assessment.
Solve addition and subtraction problems to find unknown angles. Scroll to the bottom of the article for the downloads.
Lesson Objective: The lesson is aligned to the Common Core State Standards for Mathematics – 4MD.7 Geometric Measurement – Recognize angle measure as additive.
Materials Required: Calculator
Identifying Measurement of an Angle using Addition and Subtraction
Use addition to find the angle measurement in degrees.
1. Find the measurement of angle a.
2. Find the measure of angle b.
3. Find the measure of angle c.
4. Find the measure of angle d.