Genesis 5:18 Meaning

16And Mahalaleel lived after he begat Jared eight hundred and thirty years, and begat sons and daughters:

17And all the days of Mahalaleel were eight hundred ninety and five years: and he died.

18And Jared lived an hundred sixty and two years, and he begat Enoch:

19And Jared lived after he begat Enoch eight hundred years, and begat sons and daughters:

20And all the days of Jared were nine hundred sixty and two years: and he died.