If the 6x12 tiles are in inches, it will take two of them to cover a square foot. You will need 210 of them.
Each tile covers 81 square inches. You have 1,296 square inches to cover. It will take 16 tiles to cover that area.
Approximately 73 square feet.
A tile measuring 2 foot by two foot (which, incidentally, is an unusually large tile) has an area of 4 square feet, so it would take 100 such tiles to cover a 400 square foot floor.
It will take a minimum of 138 tiles. But it could take a lot more depending on the shape that you need to cover. For example, if it is a long narrow strip which is 1.1 ft wide then, unless you want to have a huge amount of mosaic, you will need 251 tiles.
a 12 x 12 tile is 1 square foot. So, you would need 300 tiles to cover 300 square feet
24 of them.
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
A 6 ft * 12 ft tile will cover 72 square feet.
192 tiles
Since a 12x12 tile is one square foot, then 38 12x12 tiles will cover 38 square feet.
Two tiles will suffice since they will cover 36 square feet.
Each tile covers 4 square feet. You will need 24.75 tiles to cover the area.
67 tiles.
76.6 tiles
190
It will require a minimum of 1,462 tiles. That number will cover about 1,850.34 square feet.
You will need at least 67 tiles. This will cover 150.75 square feet.