Colfax Math Teacher Designs Card Game For Kids Learning Fractions Friday, August 21, 2015 | Sacramento, CA Listen / download audio Update RequiredTo play audio, update browser or Flash plugin. Colfax High School math teacher Jonathan Schwartz created an innovative card game to help kids from 2nd to 6th grade understand fractions. His game "Sudden Dozen" was successfully funded through Kickstarter.
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