To order the numbers from least to greatest you can express the fractions as decimal values first:
[tex]\frac{3}{5}=0.6[/tex][tex]\frac{1}{5}=0.2[/tex]So you have to order 0.7, 0.6 and 0.2 from least to greates, that is
[tex]0.2;0.6;0.7[/tex]Using the fractions it is:
[tex]\frac{1}{5};\frac{3}{5};0.7[/tex]