Grade 3
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Geometry
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Measurement & Data
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Number & Operations: Base Ten
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Number & Operations: Fractions
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Operations & Algebraic Thinking
Arizona Math Standard: 3.MD.C.7.c
Use tiling to show 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.