
Explanation
a fraction is a proportion of the total, for example

the numerator indicates the number of fractions you take and the denominator indicates the number of fraction in wich the number is divided
so
Step 1
so, to solve this, get a rectangle, divide by the number in the numerator and take the number of pieces as the number in the denominator
a)3/6
divide the rectangle in 6 and take 3
now for 3/8
divide the rectangle in 6 and take 3
as we can see in the graphs, the area of the blue zone is greater in 3/6
I hope this helps you