There are several solutions to your problem. They are all different ways of preprocessing your data so that it is in a suitable state for the main algorithm. Ultimately they use the facility of split with an empty string to generate a list of single characters. You can either provide your input data as a number in string, or convert your array to a string (using join most likely), then use split to create a clean list of digits:

my @number = split '', '1234567';
[download]

However with a little more preprocessing the actual addition logic becomes much simpler. Consider:

use strict;
use warnings;

my @numbers = map {[reverse split '']} qw(109156 114);
my $maxDigits = 0;

@$_ > $maxDigits and $maxDigits = @$_ for @numbers;

@numbers = map {[@$_, (0) x ($maxDigits - @$_)]} @numbers;

my @result;
my $carry;

for my $digit (0 .. $maxDigits - 1) {
    my $sum = $carry;
    
    $sum += $_->[$digit] for @numbers;
    push @result, substr $sum, -1, 1, '';
    $carry = $sum || 0;
}

@numbers = map {[reverse @$_]} @numbers;
@result = reverse @result;

print "@$_\n" for @numbers;
print '-' x ($maxDigits * 2), "\n";
print "@result\n";
[download]

Prints:

1 0 9 1 5 6
0 0 0 1 1 4
------------
1 0 9 2 7 0
[download]

Suppressing the leading zeros is left as an exercise for the reader. ;)

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