A rope around the Earth

Lesson Plan

Explore circumference and radius by comparing how added length changes circles of different sizes.

1. Question: Ask what students spot and what they are curious about. Read “How high does it get?” aloud. Have each student guess and say why.

2. Question: Read “How does its gap compare?” aloud. Have partners explain their guesses to each other.

3. Big idea: Pause. Ask a student to say the idea in their own words.

4. Real-world application: Ask: Where else have you seen this?

5. Your turn: Have students try their own. Ask them to predict before they test.