This document discusses how Bob Lochel, a high school math teacher, uses various tech tools to facilitate whole-class communication. He wants his students to be able to communicate results succinctly, use math vocabulary correctly, and critique others' ideas and writings. Some of the free tools he uses include a document camera, PollEverywhere, Edmodo, Padlet, Evernote, Today's Meet, and Answer Garden. These tools allow students to crowd-source ideas, discuss theoretical vs experimental probability, and participate in other interactive math activities as a class.