The answer is 5/8 because they both are divisable by 10
The equivalent expression of
is 
<h3>How to determine the equivalent fraction?</h3>
The fraction is given as:

Take the LCM

Express as products

Evaluate the product

Hence, the equivalent expression of
is 
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Consider the converses:
a) If two planes have no points in common, then they are parallel. (true)
b) If a point lies on the y-axis, then it has x-coordinate 0. (true)
c) If two angles have the same measure, then they are congruent. (true)
d) If a figure has four sides, then it is a square. (FALSE) (A figure with 4 sides may not even be a plane figure.)
This one is very simple.
create a simple equation to find out
15 = 12 + x
subtract 12 from each side
x= 3
the missing number is 3
or, to be even simpler, take the total, subtract the total from the number you know and the difference is the missing number.
hope I helped
ALSO, we can check going down vertically. 3 + 10 =13. this is the total listed at the bottom.
To compare two fraction we have to make common denominator, then we can compare numerators.
Lets do this

Now we can compare numeratos.
3<5, so 1/2 is greater than 3/10.