A wall in Rachel’s room is 10 ft high and 8 ft wide. The area of wallpaper required by her to cover the wall is ___ sq ft.

The figure shows the rectangle wall which is divided into squares of an area of 1 sq ft each.

Area of the wallpaper required to cover the wall = number of squares of the area of 1 sq ft

= 8 x 10 

= 80 sq ft

Therefore, the area of wallpaper required to cover the wall is 80 sq ft.