OR.4.3. Measurement: Develop an understanding of area and determine the areas of two-dimensional shapes.
4.3.1. Recognize area as an attribute of two-dimensional regions.
4.3.2. Determine area by finding the total number of same-sized units of area that cover a shape without gaps or overlaps.
4.3.3. Recognize a square that is one unit on a side as the standard unit for measuring area.
4.3.4. Determine the appropriate units, strategies, and tools to solving problems that involve estimating or measuring area.
4.3.5. Connect area measure to the area model used to represent multiplication and use this to justify the formula for area of a rectangle.
4.3.7. Solve problems involving perimeters and areas of rectangles and squares.