'One tenth' in the Bible

to whom Abraham apportioned one tenth of all the spoil, who is first, as his name shows, king of righteousness and then king of Salem, which means king of peace??3 with no father or mother or ancestry, and with no beginning to his days nor end to his life, but like no one but the Son of God, continues as priest forever.

At that moment there was a great earthquake, and one tenth of the city was destroyed. Seven thousand people were killed in the earthquake, and the rest were filled with awe, and acknowledged the glory of the God of heaven.