Using a rule as a seesaw helps students steady their understanding of the mean.

Contributor Notes

Robin O'Dell,, a member of the mathematics department at Buffalo State College, Buffalo, New York, teaches undergraduate and graduate courses for both prospective and practicing elementary and secondary teachers. She is interested in deepening the content knowledge of teachers and incorporating contemporary strands of mathematics into her teaching.

(Corresponding author is O'Dell
Mathematics Teaching in the Middle School
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