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using group activities, divide roles and responsibilities.it can help to make the silent classrooms.
You can use a hand bell to alert your kids the noise is too loud. Train your kids so that when they hear the bell they put one finger on their lip to make the “shh” sign. After a few seconds, all of your students should have their finger on their lips and should be sitting quietly.
https://youtu.be/u086rr7SRso