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A Protractor - JAPAN
Subject: Maths Elementray 4th Grade
Projectiong the same protractor as students use on the screen, and explain how to sale it. It is useful to teach how to draw angles.
This is how to project it!
1. Projecting a protractor on the screen.
Here is important point!
Write additional explanations onto what is projected on the screen. You can zoom in to the protector so that you can teach more throughly. 
2. Teaches how to scale the angles.