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my %hash=(A=>4, B=>5, C=>10, D=>2, E=>9);
my @zip = map { [ $_, $hash{$_} ] } sort keys %hash;
...
   my $f = shift @zip;
   print ("@$f * @$_ = ", $f->[1] * $_->[1], "\n") for (@zip);
} while (@zip);

my %hash=(A=>4, B=>5, C=>10, D=>2, E=>9);
my @zip = sort keys %hash;
...
       print "$f($v1) * $_($v2) = ", $v1 * $v2, "\n";
   }
} while (@zip);

A(4) * B(5) = 20
A(4) * C(10) = 40
...
C(10) * D(2) = 20
C(10) * E(9) = 90
D(2) * E(9) = 18