$$\frac { 1 } { 4 } : \frac { 1 } { 9 }$$
$\frac{9}{4}=2.25$
$$\frac{1}{4}\times 9$$
$$\frac{9}{4}$$
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$\frac{3 ^ {2}}{2 ^ {2}} = 2\frac{1}{4} = 2.25$
