Bereshis 5:13

13 And Kenan lived after he fathered Mahalal’el eight hundred and forty shanah, and fathered banim and banot;

Bereshis 5:13 Meaning and Commentary

Genesis 5:13

And Cainan lived, after he begat Mahalaleel, eight hundred
and forty years
The Septuagint has seven hundred and forty, which, added to the years given him before, makes the same sum:

and begat sons and daughters;
as his progenitors did.

Bereshis 5:13 In-Context

11 And all the days of Enosh were nine hundred and five shanim; and he died.

12 And Kenan lived seventy shanah and fathered Mahalal’el;

13 And Kenan lived after he fathered Mahalal’el eight hundred and forty shanah, and fathered banim and banot;

14 And all the days of Kenan were nine hundred and ten shanim; and he died.

15 And Mahalal’el lived sixty and five shanah, and fathered Yered;