18 what cms or inches?? Probably inches so, Inches: 115.555556 tiles so about 116 tiles needed
110 cms = 41.31 inches (to 4 sf)
http://www.manuelsweb.com/in_cm.htm
1.48 inches.
60.2 inches
11.02 inches.
About 54 inches
10.2362 inches.
11.69 inches.
11.02 inches.
91.7 (91.7323) inches.
17.5 inches is 44.45cm