How many 18 x 18 sq ft tiles will cover 440 sq ft?

Answer 1

This scenario seems unlikely. As written, an 18 x 18 foot tile would cover 324 square feet and you'd only need a little more than one to do the job. Even an 18 sq. ft. tile would be unwieldy, although you'd only need 25 of them to cover the space. I'll assume you mean 18 x 18 inches, which is 2.25 square feet. You'll need 195 of those, but get 215 to be safe.