Editing Napier's bones (section)

=== Rounding up ===
Having found the desired number of digits, it is easy to determine whether or not it needs [[rounding]] up; i.e., changing the last digit. Another digit does not need to be found to see if it is equal to or greater than 5. 25 is appended to the root and it is compared to the remainder; if it is less than or equal to the remainder, then the next digit will be at least five and rounding up is needed.  In the example above, 6839925 is less than 11669900, so the root needs to be rounded up to 6840.0.

To find the square root of a number that isn't an integer, say 54782.917, everything is the same, except that the digits to the left and right of the decimal point are grouped into twos. 

So 54782.917 would be grouped as

: {{gaps|05|47|82.91|70}}

Then the square root can be found using the process previously mentioned.