3.G.2.c
Find the area of a rectangle with whole-number side lengths by modeling with unit squares; show that area can be additive and is the same as it would be found by multiplying the side lengths.
Khan Academy ResourcesArea of rectangles reviewFind area by counting unit squaresCompare area with unit squaresFind a missing side length when given area Area of rectanglesArea and the distributive propertyCreate rectangles with a given areaArea and the distributive propertyDecomposing shapes to find area: subtractMeasuring rectangles with different unit squaresCreating rectangles with a given area 2Creating rectangles with a given area 1 Counting unit squares to find area formulaDecomposing shapes to find area: grids Decomposing shapes to find area: addTransitioning from unit squares to area formula

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