Curriculum placement
Grade 4. This describes the skill, not a learner estimate.
Measuring angles
Measure angles and find sums of adjacent angles
Problem types
- Read a protractor
- Angles that add
- Degrees in a turn
- Recognize angles and vertices
- Choose the ray at a given angle
- Equation for an unknown angle
- Estimate an angle by a benchmark
- Select the true angle readings on one protractor
Builds on
- Sides, angles, and faces
- Parallel lines, perpendicular lines, and symmetry · Earlier idea
Telling acute, right and obtuse angles by comparing with a square corner comes before measuring them. A protractor reading then puts a number on the same comparison.
- Telling time to five minutes · Useful idea
The minute hand turns 30 degrees every five minutes, so clock positions give angle measures.
Leads to
Related skills
- Classifying quadrilaterals · Shared foundations
Open the interactive map to explore lessons and skill connections.