You cannot make 0.24 into a whole number. You can make it into a fraction and percent, however!

As a fraction, 0.24 is
6/25.
To make it a percent, multiply it by 100, and then add the % sign at the end.
6/25 * 100 = 6 * 4 =
24%
As a percent, 0.24 is
24%.