$$10\times1\frac{3}{12}$$
$\frac{25}{2}=12.5$
$$10\times \frac{12+3}{12}$$
$$10\times \frac{15}{12}$$
$$10\times \frac{5}{4}$$
$$\frac{10\times 5}{4}$$
$$\frac{50}{4}$$
$$\frac{25}{2}$$
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$\frac{5 ^ {2}}{2} = 12\frac{1}{2} = 12.5$
