Since your hash values are decimal values (not hex strings), there is no need to use hex: 
use warnings;
use strict;

my %hash = (x => 10);

foreach my $x (keys %hash)
{
   printf "%02x\n", $hash{$x};
}

__END__

0a

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In reply to Re: Printing a int as hex by toolic
in thread Printing a int as hex by Dr Manhattan

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