Connect Degrees with Fractions of a Full Turn
Use the supplied full-turn fraction or subdivision.
About 20 minutes, plus any extended practice
Open lesson 1Measure and Combine Angles
Read ray turns, degree scales, adjacent angles, and unknown angle parts.
Before you begin
- Recognize a right angle; add and subtract whole numbers.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Read a Protractor from the Starting Ray
Locate the stated zero-aligned scale and read its marked ray value.
About 20 minutes, plus any extended practice
Open lesson 2Add Non-Overlapping Adjacent Angles
Identify the supplied adjacent parts and verify the stated non-overlap.
About 20 minutes, plus any extended practice
Open lesson 3Subtract to Find an Unknown Angle Part
Write whole = known + unknown.
About 20 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- Common Core State Standards, mathematics: 4.MD.C.5 — Read ray turns, degree scales, adjacent angles, and unknown angle parts.
- Common Core State Standards, mathematics: 4.MD.C.6 — Read ray turns, degree scales, adjacent angles, and unknown angle parts.
- Common Core State Standards, mathematics: 4.MD.C.7 — Read ray turns, degree scales, adjacent angles, and unknown angle parts.
These references informed the topic selection. They do not certify complete standards alignment.