# How would you write the number of significant figures present in 16,500 km?

Aug 29, 2016

There are 3 significant figures.

#### Explanation:

There are 3 significant figures - the figures shown in red.

$\textcolor{red}{16 , 5} \textcolor{b l u e}{00}$km

The blue zeros are place holders which ensure that the size of the number stays about the same.just not as accurate.

$16 , 500$km cannot round to $165$km which is quite a common error for rounding to 3 significant figures.

$20 , 000$ km would be 1 significant figure
$17 , 000$km would be 2 significant figures.
$16 , 500$ km is 3 significant figures.