$$- \frac{ 15 }{ 28 } \times \frac{ 14 }{ 30 }$$
$-\frac{1}{4}=-0.25$
$$-\frac{15}{28}\times \frac{7}{15}$$
$$\frac{-15\times 7}{28\times 15}$$
$$\frac{-105}{420}$$
$$-\frac{1}{4}$$
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$-\frac{1}{4} = -0.25$