$$13 \frac{ 1 }{ 13 } \div \frac{ 4 }{ 1 }$$
$\frac{85}{26}\approx 3.269230769$
$$\frac{13\times 13+1}{13\times 4}$$
$$\frac{169+1}{13\times 4}$$
$$\frac{170}{13\times 4}$$
$$\frac{170}{52}$$
$$\frac{85}{26}$$
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$\frac{5 \cdot 17}{2 \cdot 13} = 3\frac{7}{26} = 3.269230769230769$
