Hello madM! Welcome to PerlMonks.

i want to multiply the A with the B , then the A with the C .. A with D .. A with E.. and then B with A and so on..

I'm really not sure what you mean. What output do you expect? The only non-trivial (i.e., pure repetition) case I can think of is that you want to see each product of A*B, A*C, A*D, …, printed separately, like this:

A * B = 20
A * C = 40
A * D = 8
A * E = 36
B * A = 20
B * C = 50
:
:
[download]

Is that what you want? If so, I suggest you have a look at keys, printf, and Foreach Loops, and ponder the following:

    for my $x (sort keys %hash) {
        for my $y (sort grep { $_ ne $x } keys %hash) {
            printf "%s * %s = %d\n", $x, $y, $hash{$x} * $hash{$y};
        }
    }
[download]

If you are looking for a different result, please give us an example of the output you are expecting.