Yep. Also, the last hit will always leave the monster with less than 1 hit point left, requiring one more hit. Also, if the monster is fast regen, it will get a health tick, so it will need 2 more hits.
This can get really frustrating when you get a monster down to an empty hit bar and then because of ticks, misses, sub 1 hp left, etc. it takes 6 or more additional hits.