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back talk: Dylan’s multidigit subtraction strategy


February 2012, Volume 18, Issue 6, Page 392

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.

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Teacher reflection for back talk: Dylan's multidigit subtraction strategy