Respuesta :
Times 11.5 by 9.5 to get the total area
Then
Times 0.5 by itself to get the area of the tile
Then
Divide the total area by the area of a single tile to get the amount of tiles
If rounding is necessary always round up
Then
Times 0.5 by itself to get the area of the tile
Then
Divide the total area by the area of a single tile to get the amount of tiles
If rounding is necessary always round up