A significant figure is any number that is not 0. -- not a trailing 0.
103456.23470 to 3 sig figs is 103000
So 1256.637 to 3SF is 1260
You have to round up in this example.
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3 significant figures.
9.999 to 3 significant figures is 10.00
3 significant figures.
3 significant figures.
3 significant figures.