Full Issue | Delta-K
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Plotting the Polygonal Numbers
by Bonny H. Litwiller and David R. Duncan
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PROBLEM CORNER
edited by William J. Bruce and Roy Sinclair
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Abstract of Problem-Solving is a Reading Problem
Jeffrey Klein
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You Can’t Keep a Secret
William J. Bruce
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ELEMENTARY ACTIVITIES
William J. Bruce
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SECONDARY ACTIVITIES
William J. Bruce