Explain how you can tell that 31/33 is in the simplest form

Simplest form is a form in which we cann't divide the fractions digits like 31/33

In order to simplify a fraction, you need to divide the top and bottom

by the same number. That means that the top and bottom must have

a common factor ... you have to find that first, before you can start

simplifying. Maybe that's why they teach common factors before they

teach simplifying fractions.

Anyway, I can take one look at this fraction and see that the top and

bottom have no common factor. In fact, the top number ... 31 ... is a

prime number, so it doesn't have any factors at all, except ' 1 ' and itself.

And that's how I can tell that the fraction is in the simplest form.