If you are measuring with a ruler marked in mm, the '8' is the number of mm. The '2' can be estimated if you look closely between the millimeter marks.
There need no be any estimated digit.
It is always the last digit.
0.503..the 3
The 7
The last one.
.0002 is the estimated number
It is 0.08 M
the estimated digit in 0.0782m is?
There need no be any estimated digit.
The last digit is always the estimated digit in a number
There need not be any estimated digit but, if there must be one, then it is the last digit: 3.
500
The address of the Rio Plata Library Center is: Road 156 Km 33.5, Comerio, 00782 M
The address of the La Prieta Library Center is: Road 781 Km 2.2, Comerio, 00782 M
There need not be any estimated digit: there could well be exactly 4500.
It is always the last digit.
It is the zero at the end.