3.GM.2.2
Analyze why length and width are multiplied to find the area of a rectangle by decomposing the rectangle into one unit by one unit squares and viewing these as rows and columns to determine the area.
Khan Academy ResourcesArea of rectangles reviewFind a missing side length when given area Area of rectanglesArea of rectangles with partial arraysTransition from unit squares to area formulaCreate rectangles with a given areaDecomposing shapes to find area: subtractCreating 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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