'Fifth' in the Bible

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

God listened to Leah, and she conceived, and bore 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's produce in the seven plenteous years.

It will happen at the harvests, that you shall give a fifth to Pharaoh, and four parts will be your own, for seed of the field, for your food, for them of your households, and for food for your little ones."

Joseph made it a statute concerning the land of Egypt to this day, that Pharaoh should have the fifth. Only the land of the priests alone didn't become Pharaoh's.