how many vinyl tiles are needed to tile a kitchen measuring 10 1/2ft by 18ft if the tiles equal 25cm on each side

Answer 1

1 ft = 30.48 cm

10 1 / 2 ft = 10.5 * 30.48 = 320.04 cm

18 ft = 18 * 30.48 = 548.64 cm

320.04 * 548.64 ) / ( 25 * 25 ) =

175586.7456 / 625 = 280,93879296

Answer 2

Your answer of 280.9 tiles might work if all the scraps could be fitted together as needed. However, if we assume that no scrap can be reused, then

10.5 ft = 320 cm = 13 tiles wide
18 ft = 548cm = 22 tiles long

So, a better estimate would probably be 13*22 = 286 tiles.

Naturally, if some scraps could be made to fit in, then the true usage would be between 281 and 286