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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In the world of social enterprises, failure is a cringe-worthy moment nobody wants to talk about. But, social entrepreneurs can benefit from their failures.