The 5 (0.5 cm) is estimated.
If you have a ruler which has cm and mm (a millimeter is 0.1 centimeters) then you can measure and see that it's 1.5 cm, but at that 0.5 mark, you are estimating, because it the actual distance could really be 1.48 or 1.51 for example, but you are unable to determine that from this method of measuring. Actually, a person may be able to tell that it's either close to 1.5, and then could say 1.50 cm, or see that it's in between 1.5 and 1.4, and state that it's 1.45 cm. In those cases the last digit is estimated.
If it does not have millimeter markings, then a person could look at the measurement and say "it's about half way between 1 cm and 2 cm, then say it is 1.5 cm.
There need no be any estimated digit.
It is always the last digit.
0.503..the 3
The last one.
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
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.
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