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.
Significant figures include all the digits that are known with certainty from a measuring instrument, plus one estimated digit. The known digits are typically the numbers that are fully displayed on the instrument, while the estimated digit represents the precision of the measurement. This convention helps convey the accuracy of the measurement and indicates the level of uncertainty. For example, if a ruler shows 12.3 cm, the "12" is certain, while the "3" is the estimated digit.
To estimate the digit in 4500 miles, you can round it to the nearest thousand, which would be 5000 miles. The most significant digit in this estimate is 5. Therefore, when considering the estimated digit, it would be 5.
The estimated digit in 42.50 g is the last digit, which is 0. The value is expressed to two decimal places, indicating that the measurement is precise to the hundredths place. Thus, the estimated digit reflects a level of uncertainty in the measurement, suggesting it could range from 42.495 g to 42.505 g.
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.
Oh, dude, you're hitting me with the math questions now? Like, chill, I got this. The estimated digit in 0.0782m is 8 because it's the third digit after the decimal point. But hey, who's counting, right?
.0002 is the estimated number
It is 0.08 M
It is the zero at the end.
The estimated digit in 42.50 g is the last digit, which is 0. The value is expressed to two decimal places, indicating that the measurement is precise to the hundredths place. Thus, the estimated digit reflects a level of uncertainty in the measurement, suggesting it could range from 42.495 g to 42.505 g.
None of the digits need be estimated.