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 have been trying to compute that without success

If you do that, you'll end up with all values of the hash being the product 4*5*10*2*9. I doubt that's what you want. Or, probably I did not really understand what you exactly want. Or perhaps you want to end up with a two dimentional table? Please explain.