Help With Sig-Figs for Chemistry

So what if you had the problem

100 / .49

The calculator answer is 204.08...
How do you round for significant figures? - I think there should only be 2 b/c the .49
How would you show that 200 has 2 significant figures but happened to round down, rather than being regular 200 (with just 1 significant figure)

Thanks

You are right....When you divide or multiply, the product or quotient has equal sig figs to the one with the lowest number of sig figs. Like in your example, you would use 2 figs b/c of .49. When you add or subtract, use the one with the least decimal places

For 200, when you add the decimal point at the end, it makes it 3 sig figs. To avoid ambiguity, use scientific notation, so it would be 2.0*10^2. The ten in this case is not a sig fig and the 2.0 has two sig figs.

This is tricky, 100 has either 3 or 1. I would say go with 200.0, just to have 2.