The given difference is
[tex]1-\frac{3}{10}[/tex]To find this difference we can use the following property.
[tex]\frac{a}{b}+\frac{c}{d}=\frac{ad+bc}{bd}[/tex]So,
[tex]1-\frac{3}{10}=\frac{1\cdot10-1\cdot3}{1\cdot10}=\frac{10-3}{10}=\frac{7}{10}[/tex]