Minnesota Academic Standards
MN.4.3. Geometry & Measurement
4.3.2. Understand angle and area as measurable attributes of real world and mathematical objects. Use various tools to measure angles and areas.
18.104.22.168. Understand that the area of a two-dimensional figure can be found by counting the total number of same size square units that cover a shape without gaps or overlaps. Justify why length and width are multiplied to find the area of a rectangle by breaking the rectangle into one unit by one unit squares and viewing these as grouped into rows and columns.