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In one way or another, the Doctor has killed an extremely large number of Daleks but we don't know how many. In "The Day of the Doctor", for example, the War Doctor said there were "a billion billion Daleks" attacking Gallifrey but we've no way of knowing if he meant that as an actual count (even an approximate count) or if he just meant "a huge number". We do know that (13 incarnations of) the Doctor killed almost all of them. The Doctor has killed unknown numbers of Daleks on other occasions, too.