Okay, here we have this:
When we graph in a number line we obtain the following:
Here we can see that as 3/4 is more to the right is greater than 2/8. 3/4>2/8.
To better locate ourselves 2/8 is right in the middle of 0 and 1/2; and 3/4 is right in the middle of 1/2 and 1.