$$3\frac{1}{4}-2\frac{7}{10}$$
$\frac{11}{20}=0.55$
$$\frac{12+1}{4}-\frac{2\times 10+7}{10}$$
$$\frac{13}{4}-\frac{2\times 10+7}{10}$$
$$\frac{13}{4}-\frac{20+7}{10}$$
$$\frac{13}{4}-\frac{27}{10}$$
$$\frac{65}{20}-\frac{54}{20}$$
$$\frac{65-54}{20}$$
$$\frac{11}{20}$$
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$\frac{11}{2 ^ {2} \cdot 5} = 0.55$
