6/180: Working on associative property w/ plastic sleeves. The # don't move, just the grouping symbols. #teach180 http://pic.twitter.com/3ok2SXxIau
— Stephanie Goldberg (@sjgoldedu) September 14, 2017
6/180: Working on associative property w/ plastic sleeves. The # don't move, just the grouping symbols. #teach180 http://pic.twitter.com/3ok2SXxIau
— Stephanie Goldberg (@sjgoldedu) September 14, 2017
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