# How many significant figures are in the measurement 811.40 grams?

Aug 6, 2016

$5$

#### Explanation:

In order to be able to say how many sig figs are used for the measurement $\text{811.40 g}$, you need to know that

• non-zero digits are always significant
• a trailing zero that follows a decimal point and a non-zero digit is always significant

In your case, the measurement

$\textcolor{b l u e}{811} . \textcolor{b l u e}{4} \textcolor{red}{0}$

has four non-zero digits and one significant trailing zero.

$\textcolor{b l u e}{8 , 1 , 1 , 4} \to$ non-zero digits

$\textcolor{w h i t e}{8 , 1 , 1 ,} \textcolor{red}{0} \to$ significant trailing zero

Therefore, you can say that this measurement has five significant figures

$811.40 \to$ five significant figures