You will need: 12*24 = 288 square feet
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Length x width gives you the area of something. A room for instance. You might have to do this if you were buying a carpet for that room and needed to know what size carpet.
10 ft by 10 ft --- a 4 ft baseboard heater will work. But a longer room may need more. 10 ft by 20 ft would need an 8 foot baseboard heater. etc.
Multiply the length of the room times the width.
To calculate the number of 12x12 tiles needed for a 10x10 room, you first need to find the area of the room. A 10x10 room has an area of 100 square feet. Since each 12x12 tile covers 1 square foot, you would need 100 tiles to cover the entire room.
900 square foot