What is 27/45 in simplest form

Yup I agree with rosala.

"Simplest form" basically just means to reduce the fraction.

You can divide the top and bottom by 9 to reduce the fraction, so,

27 ÷9/45 ÷9 = 3/5!

3/5 would be the simplest form, because you can't reduce this any more. 

the simplest form of 27/45 is 3/5 !