Fractions are sections of a whole component.lets say 1 is the whole component,this makes numbers like 1/2,1/3,1/4 are fractions of the whole component 1.
We have to find half of the fraction 3/5 added to 5/7.
find the least common multiple that applies to both denominators
the LCM of both 5 and 7 is 35
divide the LCM by each denominator and multiply it with its numerator.
add the answers you get after multiplication inserting the LCM as the denominator
21+25=46
=
Now we find halfway between this angle.
÷2
we multiply
×
=
=