$$\frac{16}{20}+\frac{25}{16}\times\frac{-4}{25}$$
$\frac{11}{20}=0.55$
$$\frac{4}{5}+\frac{25}{16}\times \frac{-4}{25}$$
$$\frac{4}{5}+\frac{25}{16}\left(-\frac{4}{25}\right)$$
$$\frac{4}{5}+\frac{25\left(-4\right)}{16\times 25}$$
$$\frac{4}{5}+\frac{-4}{16}$$
$$\frac{4}{5}-\frac{1}{4}$$
$$\frac{16}{20}-\frac{5}{20}$$
$$\frac{16-5}{20}$$
$$\frac{11}{20}$$
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$\frac{11}{2 ^ {2} \cdot 5} = 0.55$
