Understanding Perimeter and Area while applying critical thinking skills to justify each student's work sample.
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Multiply 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.
Find 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.
Relate area to the operations of multiplication and addition.