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Fried, Michael N.; Goldberg, Mayer – College Mathematics Journal, 2010
Children often incorrectly reduce fractions by canceling common digits instead of common factors. There are cases, however, in which this incorrect method leads to correct results. Instances, such as 16/64 and 19/95, are well-known. In this paper, we consider such "weird fractions" and show how examples of them can be multiplied "ad infinitum" and…
Descriptors: Educational Technology, Mathematics Education, Learning Strategies, Mathematics
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Hoensch, Ulrich A. – College Mathematics Journal, 2009
We explore how curvature and torsion determine the shape of a curve via the Frenet-Serret formulas. The connection is made explicit using the existence of solutions to ordinary differential equations. We use a paperclip as a concrete, visual example and generate its graph in 3-space using a CAS. We also show how certain physical deformations to…
Descriptors: Equations (Mathematics), Calculus, Geometric Concepts, Mathematics Instruction