'Fifth' in the Bible

And there was evening and there was morning, a fifth day.

And God hearkened unto Leah, and she conceived, and bare Jacob a fifth son.

Let Pharaoh do this , and let him appoint overseers over the land, and take up the fifth part of the land of Egypt in the seven plenteous years.

And it shall come to pass at the ingatherings, that ye shall give a fifth unto Pharaoh, and four parts shall be your own, for seed of the field, and for your food, and for them of your households, and for food for your little ones.

And Joseph made it a statute concerning the land of Egypt unto this day, that Pharaoh should have the fifth; only the land of the priests alone became not Pharaoh's.