The fraction form of theses numbers are just as they sound aloud.
0.457 is four hundred fifty seven thousandths, so we write it as 457/1000
the same goes for the other three numbers
0.797 797/1000
0.815 815/1000
0.242 242/1000
granted 242/1000 can be simplified to 121/500 and 815/1000 can be simplified to 163/200. Though that only matters if you're asked to simplify.
