0.00755
Any zeros that are before an additional number do not count. Thus,
"0.00" would not count as significant figures. The first significant figure is the "7", with the "5" following it.
With the second five (in my answer), "4" was rounded up to "5" because the number behind the "4" was a "6", thus the "4" rounds up.
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7.70 It would be rounded off to 7.701, but since the 1 is less than 5, it is omitted if defined to only 3 figures.
If I round off 0.052018 to three significant figures, the result is 5.20 x 10^-2.
It already is rounded to three significant figures.
300.9
The sum of 12.16 and 324.3 is 336.5 when rounded to three significant figures.
When rounded to three significant figures, 3.738 mL becomes 3.74 mL. Remember, to round to three significant figures, you start counting from the first non-zero digit from the left.
Three significant figures. The zeros at the end are considered significant when they're after the decimal point.