If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.
You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

2-GM-1-4

Page history last edited by Tashe Harris 6 years, 2 months ago

2.GM.1.4 Recognize right angles and classify angles as smaller or larger than a right angle.

In a Nutshell

Second graders have little experience with angles. They are asked only to recognize a right angle and compare other angles to decide whether the angle is smaller or larger than a right angle. In third grade, students will classify angles as acute, right, obtuse, and straight.

Student Actions	Teacher Actions
Develop strategies for problem solving as to how to estimate an angle, selecting and using benchmarks to estimate measurements. Develop a deep and flexible conceptual understanding by comparing and ordering angles based on their size. Develop mathematical reasoning as they explore why one angle is smaller or larger than another angle.	Implement tasks that promote reasoning and problem-solving, using real-life and geometric figures for students to classify. Support productive struggle in learning about angles, providing sets of angles, feedback and assistance as needed, as well as providing multiple opportunities for comparing angle size.
Key Understandings	Misconceptions
A right angle measures to 90° such as the corner of a square. Some angles are larger than a right angle and some are smaller.	Angle size is dependent on the length of the sides.