$$3.5\times10^{-2}+2.3\times10^{-2}$$
$0.058$
$$3.5\times \frac{1}{100}+2.3\times 10^{-2}$$
$$\frac{7}{200}+2.3\times 10^{-2}$$
$$\frac{7}{200}+2.3\times \frac{1}{100}$$
$$\frac{7}{200}+\frac{23}{1000}$$
$$\frac{29}{500}$$
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$\frac{29}{2 ^ {2} \cdot 5 ^ {3}} = 0.058$
