# How do you round #1721.344# to three significant figures?

##### 1 Answer

May 11, 2017

Refer to this answer for more information on significant figures.

**Significant figures** are simply for telling you how much precision you have in your result. That is, *how sure are you to what decimal place that your answer is exact?*

To three significant figures, we retain only the nonzero digits and round down since the fourth digit is less than

#=> color(blue)(1720)#

or if we wish to write it in scientific notation...

#=> color(blue)(1.72 xx 10^3)#

How many significant figures does