With #4, its referring to #3. with my nephew who is young.

The answer is 1/4

If you'd like an explantation, I will add it.

Hope this helped =D
(I added how many 1/8 there were and how many 1/4 there were)

3/4 - 4/8

Simplify 4/8, which gives you 1/2

Then find the LCD (Least common denominator which is 4

then subtract

(I cant add a picture of how i did because my camera is blurry on my computer