CCSS.Math.Content.4.MD.C.6
The standard
Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.
Common Core State Standards for Mathematics · Measurement and Data
What this standard means
Students need to line up a protractor correctly, read the right scale, and record an angle measure in whole degrees. They also need to draw an angle when given a measure, using a ruler for the rays and a protractor to place the second ray.
Mastery looks like accurate measuring and sketching within a degree or two, plus a clear understanding that angle size is about rotation, not ray length. Common trouble spots are placing the vertex off the center mark, reading the wrong row of numbers, and drawing angles that open the wrong direction.
Ways to teach it
- Hands-on activity: Give pairs angle cards and protractors, then have them measure, label, and sort angles into acute, right, obtuse, and straight groups.
- Discussion prompt: Show two angles with different ray lengths and ask, "Which angle is larger, or are they equal, and how do you know?"
- Quick assessment: Ask students to measure three printed angles and sketch 35 degrees, 90 degrees, and 140 degrees on an exit ticket.
- Real-world connection: Have students measure angles found in classroom objects, like scissors, clock hands, book corners, and open doors.
Plan a lesson for CCSS.Math.Content.4.MD.C.6
Generate a complete lesson plan aligned to this standard, with objectives, activities, and materials. Free, no account needed.
Related standards
- CCSS.Math.Content.7.G.A.2
Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of a...
- CCSS.Math.Content.4.MD.C
Geometric measurement: understand concepts of angle and measure angles.
- CCSS.Math.Content.8.G.A.1b
Angles are taken to angles of the same measure.
- CCSS.Math.Content.4.MD.C.5
Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement: