Asquare measures 8 inches on each side. what is its area rounded off to the nearest square centimeter? (

The area of any rectangle is (length) x (width).
Your square is a rectangle, with length=width.

Using  1 inch = 2.54 centimeters, the square's area is

               (8 x 2.54 cm)  x  (8 x 2.54 cm)

           =     (20.32 cm)  x  (20.32 cm)  =  412.90⁺ cm²

Rounded to the nearest cm², it's 413 cm² .