You will need a minimum of 136 18" x 18" tiles but buy a few extra to account for breakage, etc.
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6' x 9' (54 square feet) = 6 square yards of tiles needed.
56 16x16" tiles are needed.
240 square tiles are needed
22.2 tiles so buy 23 tiles.
Floor area = 12 ft x 18 ft = 216 square feet. There are 4 six-inch square tiles needed for each square foot, so 864 tiles are needed.