Lesson 20: benchmark angles
Lesson 20 Learning Objectives:
Identify benchmark angles using reference tools
Compare other angles to these benchmark angles
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Reflect:
*Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 20 for more reflection questions, real life anchoring, playful explorations and creative invitations.
How can you tell if an angle is smaller or bigger than a right angle without measuring?
What are some helpful angles to remember and use for estimating?
How do benchmark angles help us understand shapes and spaces better?
One way I can use benchmark angles in real life is...
Math Talk:
What Math Lives Here?
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
What numbers and patterns do you notice?
What is the same and what is different between the hand measurement and protractor?
Hand benchmark strategy, Teacher's Teacher, LLC and protractor from Polypad measuring tools
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