Jackson wants to paint a 3 foot border around the edge of the floor in his room. 14ft by 10ft. What area of the floor will remain unpainted?

14*10=140 feet

140*3 = 420 feet

Take the length of the outer rectangle, 14 ft, and subtract 3 ft twice. Then take the width of the outer rectangle, 10 ft, and subtract 3 ft twice. That will give you the length and width of the inner rectangle. Then multiply that length and width of the inner rectangle to find its area.