How do you round 0.00076321 into 3 significant?

Answer 1

Two rules associated with significant figure :-.

When rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".

Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure.

Then 0.000 must be kept to show the position of the decimal point.

763 are thus the three significant figures and no change is required as the first figure to be discarded is 2 and this is less than 5.

The answer to 3 significant figures is 0.000763