I kind of understand Significant Figures, but I was having a tough time rounding.

For example, if we have 0.732m, the significant figures is 3.

If we were to round it to 2 significant figures, then the answer would be 0.73 m

Just like142,000 g has three significant figures

If we were to round it to 2 significant figures, then the answer would be 140,000 g

Another example is5.23* 10^{3}km, which has three significant figures

If we were to round it to 2 significant figures, then the answer would be 5.2 * 10^{3}km

But I'm kind of confuse on how to round something like 1050 in.

Since 1050 has 4 significant figures, then how would I make it into 2?

Since this isn't like decimals anymore, and if I get rid of the last 2 digits, 5 and 0, it will make it into 1000, which would make it only have 1 significant figure.

Can anyone explain it to me?

Thanks