Math Standard 2.G.A.2

Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.

Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units).