Significant Figures in Scientific Notation

If the distance is uncertain by a few tens of miles, as in “about 940 miles”, it is recorded as 9.4 x 102 miles. The last digit (4) is the one that is uncertain.

If the distance is uncertain by a few tens of miles, as in “about 940 miles”, it is recorded as 9.4 x 102 miles. The last digit (4) is the one that is uncertain.