Answer :

(1/2)*25 = 25/2 = 12.5 
So the 1/2 of 25 is 25/2 or 12.5
heyDB
In order to find 1/2 of a number you can simply multiply 1/2 * X (X = whatever number you want to find a half of). 

1/2 * 25

25/2

12 1/2       Decimal form: 12.5