What fraction does the picture show?

For example, 

        What fraction is this?     Answer:  

 

         What fraction is this?     Answer: ¼ 

    What fraction is this?     Answer:  

What fraction is this?     Answer: ¾ 

Challenge question:

Can you order these fractions from smallest to biggest?   ANSER: ¼ ⅓ ½ ¾