Problem: Students raising their hand
I know many teachers have their students line up if they need help or their work checked, but that never really worked for me, I found there was too much misbehaviour and wasted class time as a result. I also know that kids will sit at their desk with their hand up for a long time, also wasting time and having a sore arm as well!
I decided to try the cup system, and it works pretty well. Students have three cups stacked on their desk, a green, yellow and red one. It is on green most of the time, as they are working and not needing any help. I had them change their cup to yellow if they needed help with something, and red if they were completed their work. This way they could keep working, read a book or do something while they were waiting for me to come and see them. I also found it an easy visual to check in with.