$$-3\times\frac{13}{210}\times\frac{-3}{130}$$
$\frac{3}{700}\approx 0.004285714$
$$\frac{-3\times 13}{210}\times \frac{-3}{130}$$
$$\frac{-39}{210}\times \frac{-3}{130}$$
$$-\frac{13}{70}\times \frac{-3}{130}$$
$$-\frac{13}{70}\left(-\frac{3}{130}\right)$$
$$\frac{-13\left(-3\right)}{70\times 130}$$
$$\frac{39}{9100}$$
$$\frac{3}{700}$$
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$\frac{3}{2 ^ {2} \cdot 5 ^ {2} \cdot 7} = 0.004285714285714286$