Khan Academy Static

Topic A includes lessons 1-4. "Understand area as an attribute of plane figures. Decompose and recompose shapes to compare areas. Model tiling with centimeter and inch unit squares as a strategy to measure area. Relate side lengths with the number of tiles on a side." EngageNY

8678_Intro_to_area_and_unit_squares.html

8679_Measuring_rectangles_with_different_unit_squares.html