Mary is building a mosaic for her school cafeteria's wall. It will be 10 feet tall and 15 feet long. Each tile she uses is 1 inch square. How many tiles will she need?
First convert the length of the mural to inches: 15 feet * 12 inches/foot = <<15*12=180>>180 inches
Then convert the height of the mural to inches: 10 feet * 12 inches/foot = <<10*12=120>>120 inches
Then multiply the length and the height to find the total area of the mural: 180 inches * 120 inches = <<180*120=21600>>21600 square inches. Since each tile is 1 square inch, this is also the number of tiles she needs.
#### 21600