on the GMAT Fractions are expressed in their most reduced form. This means that you'll have to simply your anwers, for instance , by reducing fractions. To reduce a fraction, simply find a number that's a factor of both its numerator and denominator, and factor it out, like this.
35/49=5/7 x7/7=5/7x7/7=5/7x1=5/7 Redcuing a fraction makes it easier to work with, which makes it less likely that you'll commit an error. Common factors to start with when you're reducing are 2, 3, and 5.