To pave a room with a length of 9 meters and a width of 6 meters, how many decimeter square floor tiles are suitable? How many pieces are needed?

To pave a room with a length of 9 meters and a width of 6 meters, how many decimeter square floor tiles are suitable? How many pieces are needed?

54 pieces with a side length of one meter
6 pieces with side length of 3 meters