CCSS.Math.Content.3.MD.C.7c
Use tiling to show in a concrete case that the area of a rectangle with whole-number side lengths <i>a</i> and <i>b</i> + <i>c</i> is the sum of <i>a</i> × <i>b</i> and <i>a</i> × <i>c</i>. Use area models to represent the distributive propert
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