Question 826058
If the tiles are 33centimetres by 33cm how many tiles will you need for 18 foot by 11 foot 

I'd suggest finding out how many cm are in a ft
30.48cm = 1ft
548.64cm =18ft
335.28cm = 11ft
Find the area of the space for where the tiles will go
548.64 times 335.28 = 183948.019cm
No find area of 1 tile
33 times 33 = 1089cm
Now divide to see how many tiles can fit
183948.019 / 1089 = 168.914618 
Round down to get amount of full tiles that will fit to whole number
168 tiles will fit in that space

This was done on an iPhone so you can do math anywhere.