|Posted: 21 September 2007 at 12:22pm | IP Logged
0.571429 has 6 significant figures
350 has 2 significant figures
64 has 2 significant figures
1.3 x 10^2 has 2 significant figures
1.30 x 10^2 has 3 significant figures
Although I generally do not advise using Wikipedia (they distort facts alot and my teachers actually forbid us from using Wikipedia as a source for our research papers), there is a pretty simple explanation on what is a significant figure and what isn't. Don't worry, you'll eventually get the hang of it. It just takes a little while.