$$3 \frac { 2 } { 5 } - 2 \frac { 1 } { 4 }$$
$\frac{23}{20}=1.15$
$$\frac{15+2}{5}-\frac{2\times 4+1}{4}$$
$$\frac{17}{5}-\frac{2\times 4+1}{4}$$
$$\frac{17}{5}-\frac{8+1}{4}$$
$$\frac{17}{5}-\frac{9}{4}$$
$$\frac{68}{20}-\frac{45}{20}$$
$$\frac{68-45}{20}$$
$$\frac{23}{20}$$
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$\frac{23}{2 ^ {2} \cdot 5} = 1\frac{3}{20} = 1.15$
