If I have 100 square feet of 18'' x 18'' tiles, how many tiles do I have?

18“x18“=324“/144=2.25sqft/tile 100/2.25=44 tiles total

for 300 sf how much thin set do i need?

Between 44/45 .. Like Paul said 44.44 pcs to be exact. Its hard to say the exact pcs since there are very few true 18×18 tile.
Any questions you can e mail me through my avatar. GL

About 44.

Each tile is 1.5 feet x 1.5 feet, which is 2.25 square feet per tile. 100/2.25 = 44.44.

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