Small Numbers
Small numbers are treated similarly. If a small distance is quoted as 4.5 x 10-2 inch, the last digit (5) is uncertain. It is in the one-thousandth’s place (0.045) implying an uncertainty of a few thousandths of an inch
If the distance were quoted as 4.52 x 10-2 inch, the last digit (2) is uncertain. It is in the one-ten-thousandth’s place (0.0452) implying an uncertainty of a few ten-thousandths of an inch.