$$2 \frac{ 1 }{ 3 } \times 2 \frac{ 1 }{ 4 }$$
$\frac{21}{4}=5.25$
$$\frac{6+1}{3}\times \frac{2\times 4+1}{4}$$
$$\frac{7}{3}\times \frac{2\times 4+1}{4}$$
$$\frac{7}{3}\times \frac{8+1}{4}$$
$$\frac{7}{3}\times \frac{9}{4}$$
$$\frac{7\times 9}{3\times 4}$$
$$\frac{63}{12}$$
$$\frac{21}{4}$$
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$\frac{3 \cdot 7}{2 ^ {2}} = 5\frac{1}{4} = 5.25$
