Mark intends to tile a kitchen floor, which is 9 by 11 ft. How many 6-inch tiles are required to tile the floor?

a. 60

b. 99

c. 396

c. Since the tiles are calculated in inches, convert the area of the floor to inches as well. The length of the floor is 9 ft × 12 in per foot = 108 in. The width of the floor is 11 ft × 12 in per foot = 132 in. The formula for area of a rectangle is length × width. Thus, the area of the kitchen floor is 108 in × 132 in or 14,256 in². The area of one tile is 6 in × 6 in or 36 in². Divide the total number of square inches by 36 in² or 14,256 in² divided by 36 in² = 396 tiles.