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If it's really square you should need 156 18" tiles to cover 350 square feet. Most tile stores let you return unused tiles, so I suggest you get a few extra. The number needed can change based on the grout space, how many you break and if the area isn't square you may need more. A rule of thumb is to add 10% for waste. That rule would say to buy about 175.
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Continue Learning about Geometry
How many 18x18 tiles cover 85 square feet?
start with 38 tiles.
How many 18x18 tiles does it take to cover 300 square feet?
118
How many 18x18 tiles are needed for 221 square feet?
The answer depends on the measurement units used for 18x18.
How many 18x18 square inch tiles are needed for 50 square feet?
22.2 tiles so buy 23 tiles.
How many 18x18 square feet vinyl tiles it take to cover 249 square feet?
18 inches = 1.5 ft, so each tile is 2.25 sq ft, number required = 249/2.25 = 111
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