Nerida Fay Ellerton (née Gersch, born 1942) is an Australian mathematics educator and historian of mathematics. She is professor of mathematics education at Illinois State University. As well as studying the present state of mathematics education, she and her husband McKenzie A. (Ken) Clements have researched the history of mathematics education, in the process discovering school worksheets in the Harvard Library that are among the oldest known writings of Abraham Lincoln.
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