Abstract

Mary excitedly waved a shiny new minicalculator at her third-grade teacher exclaiming, “Mr. Ditton, Mr. Ditton, see what Daddy gave me for my birthday.” Sharing her enthusiasm, Mr. Ditton examined the calculator carefully, “Isn't this terrific? Now you can work all those long messy problems that you have always hated to do.” Mary's elation quickly subsided, “But I can't Mr. Ditton, I can't. I don't know what all these numbers mean.”

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