Three. Trailing zeros do not count unless there is a decimal involved.
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There are only 2 significant figures in 60800000: 6 and 8. The zeros in this number are considered to be placeholders and are not significant.
There are 3 significant figures in 94.2.
4487 has four significant figures.
101330 has 6 significant figures.
4 significant figures.
3 significant figures.