sqrt(270) =sqrt(9xx30)
color(white)("XXX")=sqrt(3^2xx30)
color(white)("XXX")=sqrt(3^2)xxsqrt(30)
color(white)("XXX")=3sqrt(30)
color(white)("XXX")30 does not contain any factors which are squares
color(white)("XXX")and therefore sqrt(30) can not be reduced further;