Vladmir makes a good point. Multiply has the connotation that expected outcomes are best determined by probability. It doesn't comment on whether one should value lives linearly (or at all). It does imply utilitarianism. At least, it implies that the expected outcome is significantly relevant to your decision. I'm not sure what Vladmir means by 'total utilitarianism'.

It seems to me that besides not just relying on feelings and intuitions, "compute" has the connotation that we already know what the right morality is, and can just apply it mechanically

I agreed up to here.