Just print, laminate and hang it on your whiteboard or blackboard.
Put one color magnet on one side to show the expected voice level for the class during an activity.
Use a second color magnet on the other side to show the actual voice level of the class.
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I also have a blog where you can get other freebies from time to time.
Talking Level Poster by Michael Allen Kelly is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.