No need to put things in order... just harness the powers of .. and a literal hash slice: 
my %hash = qw( 100 g 101 j 102 d 103 h 104 t 105 a );

my $number = 3;
my $start  = 101;
delete @hash{$start .. $start+$number-1};

[download]
enjoy! 
--
Casey
   I am a superhero.

In reply to Re: Removing a certain number of hash keys by cwest
in thread Removing a certain number of hash keys by myocom

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