# Using a Circular Protractor

Videos to help Grade 4 students learn how to use a circular protractor to understand a 1-degree angle as 1/360 of a turn. Explore benchmark angles using the protractor.

Common Core Standards: 4.MD.5, 4.MD.6

## New York State Common Core Math Module 4, Grade 4, Lesson 5

NYS Math Module 4 Grade 4 Lesson 5 Application Problem

How many right angles can fit into a circle?

NYS Math Module 4 Grade 4 Lesson 5 Concept Development

Problem 1: Reason about the number of turns necessary to make a full turn with different fractions of a full turn.

Problem 2: Use a circular protractor to determine that a quarter-turn or a right angle measures 90 degrees, a half turn measures 180 degrees, a three quarter-turn measures 270 degrees, and a full rotation measures 360 degrees.

Problem 3: Measure and draw benchmark angles with the protractor.

Lesson 5 Concept Development

We have a special name for 1/360 of a whole turn. It is called a degree. There are 360 degrees are in one whole turn? A protractor is a tool that has been partitioned and marked off to show 360 degrees.

NYS Math Module 4 Grade 4 Lesson 5 Problem Set

Find the measures of the following angles using your circular protractor.