Common Core Alignment:.

3.MD.5a:

Measurement And Data

Geometric Measurement: Understand Concepts Of Area And Relate Area To Multiplication And To Addition.

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.

3.MD.5b:

Measurement And Data

Geometric Measurement: Understand Concepts Of Area And Relate Area To Multiplication And To Addition.

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.

3.MD.6:

Measurement And Data

Geometric Measurement: Understand Concepts Of Area And Relate Area To Multiplication And To Addition.

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