In general, you don't. Serial numbers are counters and security features, but only affect a bill's value in specific cases. Normally the bill's series date and letter as well as its condition are much more important in determining a value.
However, if the serial number is unusual in some way; e.g. low (00000010) or has an "interesting" pattern such as 13577531 or 12345678, there are collectors who will pay a premium.
$20
The value is determined by the series (date) and condition.
The value is more dependent on the year (series) of the bill. The serial number by itself isn't enough information.
The serial number alone isn't enough to assign value, but rather the series year and the condition. Without more information, it's assumed to be worth one dollar.
It's worth exactly 10 dollars.
Depends on year and how low the serial number is.
$20
$20
$10
The percentage of a partial bill really has little to do with its value. Any bill is worth its face value if it contains a complete serial number and any part of the other serial number.
As you have seen in many other postings, a bill's serial number almost never has anything to do with its value.
$5
The value is determined by the series (date) and condition.
The value is more dependent on the year (series) of the bill. The serial number by itself isn't enough information.
$20 Dollars.
100 dollars...idiot
The value of a ten dollar bill is $10. The serial number on a bill does not affect its face value but can sometimes be of interest to collectors for its rarity or unique pattern.