$$7 \times 2 \frac { 1 } { 4 }$$
$\frac{63}{4}=15.75$
$$7\times \frac{8+1}{4}$$
$$7\times \frac{9}{4}$$
$$\frac{7\times 9}{4}$$
$$\frac{63}{4}$$
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$\frac{3 ^ {2} \cdot 7}{2 ^ {2}} = 15\frac{3}{4} = 15.75$
