3.MD.C.7

Relate area to the operations of multiplication and addition.

3.MD.C.7.aFind the area of a rectangle with whole-number side lengths by tiling it, and show that the area is the same as would be found by multiplying the side lengths.3.MD.C.7.bMultiply side lengths to find areas of rectangles with whole-number side lengths in the context of solving real world and mathematical problems, and represent whole-number products as rectangular areas in mathematical reasoning.3.MD.C.7.cUse 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.3.MD.C.7.dRecognize area as additive. Find areas of rectilinear figures by decomposing them into non-overlapping rectangles and adding the areas of the non-overlapping parts, applying this technique to solve real world problems.
Khan Academy Resources
Area of rectangles reviewFind a missing side length when given area Area of rectanglesArea and the distributive propertyArea of rectangles with partial arraysDecompose figures to find areaTransition from unit squares to area formulaUnderstand decomposing figures to find areaCompare areas by multiplyingArea and the distributive propertyDecomposing shapes to find area: subtractComparing areas of plots of landCreating 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: addArea word problem: house sizeFinding missing side when given areaTransitioning from unit squares to area formula
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