Use "secret" hand signals to have students SHOW you what they need. Each finger means something different, so the teacher can differentiate what kids need when there are 7 hands raised! Great classroom management technique for nonverbal communication.
This is a quick and easy formative assessment to quickly assess if your students are learning what they need to. The teacher asks a question and students used a hand signal to show their understanding.
These are different hand signals students can hold up in the air when they need to tell the teacher something; rather than shouting across the room or waiting for the teacher to come to the student's desk.