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I let everyone know at the start of our session that it would help me if they could type their questions in chat rather than yelling them across the room.  This worked really well for some interactions, but some were not good typists, and all of them were still quite boisterous. I used “freeze students” a few times to remind them to bring their noise level back under control.

Like how with Scratch ( you know, the awesome lego like visual programming language from MIT www.scratch.mit.edu) they have Scratch cards, printable snippets of code that are easily laminated and can be used to give kids a starting point.