To turn ANY fraction to a decimal you have to divide the numerator by the denominator. The answer to that is the decimal form of the fraction. Lets do it:-
13/25 (fraction)
13 ÷ 25 = decimal form
13 ÷ 25 = 0.52
So, the fraction, 13/25 in decimal form is 0.52.
Hope I helped ya!! xD