3.MD.C.5.b
Understand that a plane figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.
Khan Academy ResourcesArea: FAQArea of rectangles reviewFind area by counting unit squaresCompare area with unit squaresArea and the distributive propertyDecompose figures to find areaTransition from unit squares to area formulaCompare areas by multiplyingUnderstand areaCompare area and perimeterArea and the distributive propertyComparing areas and perimeters of rectanglesComparing areas of plots of landMeasuring rectangles with different unit squaresIntro to area and unit squares

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