$$3 \frac{ 1 }{ 7 }$$
$\frac{22}{7}\approx 3.142857143$
$$\frac{21+1}{7}$$
$$\frac{22}{7}$$
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$\frac{2 \cdot 11}{7} = 3\frac{1}{7} = 3.142857142857143$
