Rounding numbers to significant figures?

Question

 is 0.000319 the right answer for rounding 0.0003192 so it contains 3 significant figures?

Answer 1

Yes, you begin at the left-most, non-zero digit and count from there.

Answer 2

Yes! The first 0's are just place holders. Everything after that tell us something about the accuracy of the measurement, and are therefore significant digits. For more, here's a website I found:

 

http://www.purplemath.com/modules/rounding2.htm