There need no be any estimated digit.
It is always the last digit.
0.503..the 3
The 7
The last one.
500
One possibility is 5000 ml
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.
There need not be any estimated digit: there could well be exactly 4500.
It is always the last digit.
.0002 is the estimated number
It is 0.08 M
It is the zero at the end.
None of the digits need be estimated.