This is aligned with the following California State Standards:
Communicate understanding of separateness by recognizing objects that are not joined together. Communicate generic understanding of some as a certain amount or a number of people or things.
Communicate understanding that a unit square is a square with edge lengths of 1 unit and area of 1 square unit. Communicate understanding of area as the measure of space contained within the outline or boundary of a two-dimensional object or figure.
Calculate the area of a square or rectangle by filling a figure with unit squares or tiles and counting the total number of unit squares or tiles. Calculate the area of a square or rectangle by counting the number of square units drawn to cover the area.
Find the unknown quantity in the word problem by determining the area of a rectangle.
Communicate understanding that length and width measures of a rectangle can be used to find the number of unit tiles needed to fill the rectangle and that the number of tiles equals the product of the length and width. Calculate area of a rectangle using the area formula (area = length x width).