CCSS.Math.Content.4.MD.C.5b
The Standard
An angle that turns through n one-degree angles is said to have an angle measure of n degrees.
Common Core State Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students treat one degree as a unit for measuring a turn. They determine an angle’s measure by counting how many one-degree turns fit between its rays.
What Mastery Looks Like
- Students connect the number of equal one-degree turns to the angle’s measure. They can explain that ray length and rotation direction do not change that measure.
Common Misconceptions
- Students may think longer rays create a larger angle. They may count marks instead of spaces, or confuse the direction of a turn with its measure.
How to Assess It
- Exit ticket: Draw a ray that turns 73 one-degree steps from its starting position. State the angle measure and explain what 73 counts.
Lesson moves
Ways to Teach It
Give students a paper circle divided into 360 sectors and two hinged strips; they open an angle, count sectors, and label its measure.
Maya says longer rays make a larger angle; draw a counterexample and explain what actually determines angle measure.
Play Angle Match: students pair an angle card with a card stating how many one-degree turns it contains.
Use clock hands to compare quarter, half, and smaller turns, then describe each angle as a count of one-degree turns.
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Printable 4.MD.C.5b Worksheet
A ready-to-print activity worksheet aligned to CCSS.Math.Content.4.MD.C.5b, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
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