The Spin on Angles

Students use fractions and decomposition to determine the size of angles in degrees. Note: Activities 1 and 2 were updated in the Teacher Edition PDF and in the Teacher Presentation Screens on 1/12/2026.

By Amplify Classroom

4th Grade

Math

Today’s Goals • Determine the measurements of angles in degrees based on an understanding of `1` degree as `\frac{1}{360}` of a circle. • Recognize angle measure as additive by using known angle measures to determine the measures of unknown angles. Materials • Students using print: Activity 2 PDF (optional), Activity 2 PDF (answers) (optional)