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.
To determine the number of small glass squares that can fit in the window space, we need to first calculate the area of the window space.
The area of a rectangular space is calculated by multiplying its length by its width.
The area of the window space is 9 feet * 6 feet = <<9*6=54>>54 square feet.
Since each small glass square has sides that are 1 foot long, the area of each square is 1 foot * 1 foot = 1 square foot.
To find the number of small glass squares that can fit in the window space, we divide the area of the window space by the area of each square.
Number of small glass squares = 54 square feet / 1 square foot = <<54/1=54>>54 squares.
Therefore, the library can add 54 small glass squares to the window space.