$$3\times1\frac{1}{4}$$
$\frac{15}{4}=3.75$
$$3\times \frac{4+1}{4}$$
$$3\times \frac{5}{4}$$
$$\frac{3\times 5}{4}$$
$$\frac{15}{4}$$
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$\frac{3 \cdot 5}{2 ^ {2}} = 3\frac{3}{4} = 3.75$
