$$13 \frac { 1 } { 4 } - \frac { 1 } { 2 } =$$
$\frac{51}{4}=12.75$
$$\frac{52+1}{4}-\frac{1}{2}$$
$$\frac{53}{4}-\frac{1}{2}$$
$$\frac{53}{4}-\frac{2}{4}$$
$$\frac{53-2}{4}$$
$$\frac{51}{4}$$
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$\frac{3 \cdot 17}{2 ^ {2}} = 12\frac{3}{4} = 12.75$