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Common Core Teaching Resources

CCSS.MATH.CONTENT.3.MD.C.7.C

In Grade 3 Standards for Mathematical Practice Measurement & Data Geometric measurement: understand concepts of area and relate area to multiplication and to addition CCSS.MATH.CONTENT.3.MD.C.7
Use tiling to show in a concrete case that the area of a rectangle with whole-number side lengths a and b + c is the sum of a × b and a × c. Use area models to represent the distributive property in mathematical reasoning.