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-All the non-zero numbers are considered significant.
-Zeroes that are in between numbers are significant. e.g. 208
     the zero in between is counted as a significant figure
-leading zeroes are not significant. e.g. 0.0001
     the zeroes before 1 are not counted as significant
-trailing zeroes are significant. e.g. 100
     the zeroes after 1 are significant

For the given number 30.0, there are 3 significant figures/numbers

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In 30.0 there are only two significant numbers because if zeroes can be found after the decimal point at the last it is not significant.

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