An angle measures 125 degree. Through what fraction of a circle does the angle turn?

Well a circle is 360 degrees and the angle turns 125 of that. a fraction can be considered a ratio of a part of the whole vs the whole and can be written as:

part/whole

So the part is 125 and the whole is 360 so

125/360

This can be reduced by 5

25/72

That is your answer