# How do you write 0.000 40 in scientific notation?

Mar 4, 2018

$4 \cdot {10}^{-} 4$

#### Explanation:

$4 \cdot {10}^{-} 4$
$4 \cdot \frac{1}{10000}$
$\frac{4}{10000}$
$0.0004 = 0.00040$

Mar 4, 2018

The decimal point needs to be moved 4 places to the right so the exponent for the 10s term will be negative:

$0.00040 = 4.0 \times {10}^{-} 4$