.00345, 34567, and .39022000 all have five sig figs.
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There are 4 significant figures. If a number has a decimal point with some zeroes, we count the total number of digits. Therefore, we count four significant figures.
one
25's square root is 5
Yes, 0.2 is the same as 0.200. When a number is written with trailing zeros after the decimal point, it does not change the value of the number. Both 0.2 and 0.200 represent the same quantity, which is two tenths.
For multiplication/division, use the least number of significant figures (ie 6.24 * 2.0 = 12). For addition subtraction, use the least specific number (ie 28.24 - 2.1 = 26.1)