> What concept did I miss? 

perlnumber describes the correct notation of hexadecimal literals:

$n = 0x1234; # hexadecimal integer° HTH! :)

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Wikisyntax for the Monastery

update

°) hence my $divisor = 0x10; will avoid the division by zero

See also vexed by the hex!

UPDATE

details here Re^3: hexadecimal division (string to number casting only for decimal! numbers! )

In reply to Re: hexadecimal division by LanX
in thread hexadecimal division by holandes777

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