In a room 12 feet wide by 22 feet long how many 13 inch square tiles would you need to cover the floor?

228 pcs if you evenly space them side to side - meaning that you end up with the same sized pieces at the end of each row in each direction. You would have 10 full pieces and 2 partial pieces for each row width wise and 17 full pieces and 2 partial pieces for each row length wise. The width wise partial for each row can be cut from1 piece and the same goes for the legth wise partial pieces.