$$\frac{10}{10}+\frac{5}{20}$$
$\frac{5}{4}=1.25$
$$1+\frac{5}{20}$$
$$1+\frac{1}{4}$$
$$\frac{4}{4}+\frac{1}{4}$$
$$\frac{4+1}{4}$$
$$\frac{5}{4}$$
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$\frac{5}{2 ^ {2}} = 1\frac{1}{4} = 1.25$