Teachers use a variety of strategies, such as visibly random grouping, vertical non-permanent surfaces (like dry-erase boards) and the "one-marker-no-erasing" rule.
"With this simple phrase, teachers are transforming their classrooms and inspiring students to become confident mathematicians," says Peter Liljedahl.
"There is an energy in the classrooms that is contagious," says Fitzpatrick.
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Mashable is teaming up with Google+ for its first-ever Hangout-a-thon on Dec. 3 for Giving Tuesday. The Hangout-a-thon is a phoneathon for the connected generation of the 21st century, which features 12 hours of captivating guests sharing updates on some of the most disruptive nonprofits working today.