**MCC.3.MD.5.
Recognize
area as an attribute of plane figures and
understand concepts of area measurement. **

**a.
A square with side length 1 unit, called “a
unit square,” is said to have “one square
unit” of area, and can be used to measure
area. **

**b.
A plane figure which can be covered without
gaps or overlaps by n unit squares is said to
have an area of n
square units. **