[caption id="attachment_102157" align="alignleft" width="150"] Sixth graders at Waukesha STEM Academy work on an exploration related to baseball marketing for class. (Angela Peterson/Milwaukee Journal Sentinel/MCT)[/caption]

Last year, Kim Crosby spent about 80 percent of her class time teaching math concepts at Waukesha STEM Academy in Wisconsin. For the other 20 percent, she helped students individually.

This year, that time was reversed: 80 percent of her class time was spent moving from student to student; about one-fifth continued to be a standard lecture format. The rest of the direct-instruction materials she wanted students to see,...

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