One way is to use "sum" from List::Util: 
use strict;
use warnings;
use List::Util qw(sum shuffle);
use List::MoreUtils qw(natatime);
use feature qw(say);

my $iterator = natatime 5, shuffle( 1 .. 50 );
my $count = 1;
while ( my @five = $iterator->() ) { 
    say sum(@five);
    $count++; 
    last if $count > 5;
}

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See also:

In reply to Re: Sum group of numbers and display each number is on its own line by toolic
in thread Dice roll chances by Anonymous Monk

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