First you have to change the inches to feet. So you divide 13/12 (because there are 12 inches in one foot). So the tiles are now 1.08 feet x 1.08 feet. Multiply the two sides together to get the area of one tile. 1.08 x 1.08 = 1.16 square feet.
Now divide the whole area of the room (150 square feet) by the area of one tile to find how many tiles are needed.
150/1.16 = 129.3 tiles.
(When ordering tiles you should always order a few more to cover any breakages etc. )
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144
18..
'180'
Each tile is 1 square foot.
18*18 = 324 tiles.