A library wants to add a rectangular window made of small glass squares. The window space is 9 feet long and 6 feet wide. Each small glass square has sides that are 1 foot long. How many small glass squares are needed to make the window?
The area of the window space is 9 feet * 6 feet = <<9*6=54>>54 square feet
Each small glass square has an area of 1 foot * 1 foot = <<1*1=1>>1 square foot
To fill the window space, the library would need 54 square feet / 1 square foot/square = <<54/1=54>>54 small glass squares. Answer: \boxed{54}.