$$\frac { 2 } { 7 } \times \frac { 7 } { 9 }$$
$\frac{2}{9}\approx 0.222222222$
$$\frac{2\times 7}{7\times 9}$$
$$\frac{2}{9}$$
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$\frac{2}{3 ^ {2}} = 0.2222222222222222$
