How to find the area of a floor that is 12ft by 15ft?

A=lxw

a=area
l=length
w=width

so a=12*15
so the area would be 160 ft. 

 First convert the linear dimensions from feet to yards: 12 ft = 4 yd, 15 ft = 5 yd. Then when you multiply yards by yards, you get an area in square yards, namely, 4 yd * 5 yd = 20 square yards.