Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[\frac{9\times -2}{4\times 5}\]
Simplify \(9\times -2\) to \(-18\).
\[\frac{-18}{4\times 5}\]
Simplify \(4\times 5\) to \(20\).
\[\frac{-18}{20}\]
Move the negative sign to the left.
\[-\frac{18}{20}\]
Simplify \(\frac{18}{20}\) to \(\frac{9}{10}\).
\[-\frac{9}{10}\]
Decimal Form: -0.9
-9/10
