First, we need to convert the mixed number into a fraction
[tex]3\text{ }\frac{2}{5}=\frac{15}{5}+\frac{2}{5}=\frac{17}{5}[/tex][tex]3\frac{1}{2}=\frac{6}{2}+\frac{1}{2}=\frac{7}{2}[/tex][tex]3\text{ }\frac{3}{8}=\frac{24}{8}+\frac{3}{8}=\frac{27}{8}[/tex]then we can convert them into a decimal number
[tex]\frac{17}{5}=3.4[/tex][tex]\frac{7}{2}=3.5[/tex][tex]\frac{27}{8}=3.37[/tex]in a decimal number is easier to order the number for example the bigger to smaller
[tex]3\text{ }\frac{3}{8},\text{ 3}\frac{1}{2},3\frac{2}{5}[/tex]