$$(2\frac{1}{2}-\frac{7}{8})+\frac{3}{10}$$
$\frac{77}{40}=1.925$
$$\frac{4+1}{2}-\frac{7}{8}+\frac{3}{10}$$
$$\frac{5}{2}-\frac{7}{8}+\frac{3}{10}$$
$$\frac{20}{8}-\frac{7}{8}+\frac{3}{10}$$
$$\frac{20-7}{8}+\frac{3}{10}$$
$$\frac{13}{8}+\frac{3}{10}$$
$$\frac{65}{40}+\frac{12}{40}$$
$$\frac{65+12}{40}$$
$$\frac{77}{40}$$
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$\frac{7 \cdot 11}{2 ^ {3} \cdot 5} = 1\frac{37}{40} = 1.925$
