Since 2 is an integer, there is no particular need to express it as a fraction  although if you were to give the fraction a denominator of 1, it could be expressed as 2/1.
http://wiki.answers.com/Q/What_is_the_fraction_for...

0.3 can be expressed in several ways. To change to a percent: Number ( In this case, 0.3 ) X 100 = The Result ( In this case, 30 ) and then a percent sign over it ( Ctrl + 5 ) 30%
http://wiki.answers.com/Q/What_is_0.3_into_a_fract...

one over ten.
http://wiki.answers.com/Q/What_is_0.1_in_fraction

what is the answer to 0.55 as a fraction? It is 55/100 or by both dividing numerator and denominator by 5 it reduces to 11/20.
http://wiki.answers.com/Q/What_is_0.55_as_a_fracti...
