Dylan's multidigit subtraction strategy

• Autores: Rachael M. Welder, Megan Kelly Murray (ed. lit.), Jane P. Moore (ed. lit.)
• Localización: Teaching Children Mathematics, ISSN 1073-5836, Vol. 18, Nº 6, 2012, págs. 392-393
• Idioma: inglés
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• Resumen

  • Without having been taught a method for solving subtraction problems that require regrouping, a first-grader applies his natural knowledge of numbers and operations to solve problems containing two- and three-digit numbers. This conversation features his reasoning as he formulates an explanation of the computational strategy he developed.

    Online extra: http://www.nctm.org/tcm010