# How do you simplify -2.7times 3.9?

Aug 27, 2016

You can multiply by $10$ twice to scale both decimals, then divide your answer by $10$ twice to reverse it.

$\textcolor{b l u e}{- 2.7 \times 3.9}$

$= \frac{1}{100} \left(- 27 \times 39\right)$

$= \frac{1}{100} \left(- 30 \times 39 - \left(- 3 \times 39\right)\right)$

$= \frac{1}{100} \left(- 1170 - \left(- 117\right)\right)$

$= \frac{1}{100} \left(- 1170 + 117\right)$

$= \frac{1}{100} \left(- 1053\right)$

$= \textcolor{b l u e}{- 10.53}$