These shapes have a quarter shaded (¼) because the shaded part is one part out of four equal parts.
1/4 shaded 
This shape has three quarters shaded (¾) because the shaded part is three parts out of four equal parts.
3/4 shaded 
This shape has two quarters shaded (2/4) because the shaded part is two parts out of four equal parts. But it is better to say that it has half shaded (½).
1/2 shaded 
This shape has one third shaded (1/3) because the shaded part is one part out of three equal parts.
1/3 shaded 
