Express 0.0063075 correct to three significant figures.
Significant figures, any of the digits of a number beginning with the digit farthest to the left that is not zero and ending with the last digit farthest to the right that is either not zero or that is a zero but is considered to be exact.
0.0063075
The leading zeros (0) are not significant.
The significant figures are 6, 3, 0, 7 and 5
The third significant falls on 0 but the next significant to it is more than 4 hence 1 is added to the 0 (0 + 1) making 1.
0.0063075 = 0.00631 (three significant figures)
