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There need no be any estimated digit.
It is always the last digit.
4.25 kg is equal to 4250 grams.
0.503..the 3
The 7
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
4.25 kg is equal to 4250 grams.
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.