Measurement and data
3.MD.C.7
Relate area to multiplication and addition, finding the area of a rectangle by tiling it and by multiplying its side lengths.
Practice for this standard
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Area, perimeter and volume
Perimeter and area of rectangles, squares and right triangles, and the volume of a box.
Official wording and the full standard: CCSS.MATH.CONTENT.3.MD.C.7