$$8 \frac { 3 } { 10 } - 4 \frac { 4 } { 5 }$$
$\frac{7}{2}=3.5$
$$\frac{80+3}{10}-\frac{4\times 5+4}{5}$$
$$\frac{83}{10}-\frac{4\times 5+4}{5}$$
$$\frac{83}{10}-\frac{20+4}{5}$$
$$\frac{83}{10}-\frac{24}{5}$$
$$\frac{83}{10}-\frac{48}{10}$$
$$\frac{83-48}{10}$$
$$\frac{35}{10}$$
$$\frac{7}{2}$$
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$\frac{7}{2} = 3\frac{1}{2} = 3.5$
