A Biblical Example of the number 70 is found in Jeremiah 25:9-11:
“9 Behold, I will send and take all the families of the north, saith the LORD,
and Nebuchadrezzar the king of Babylon, my servant, and will bring them against
this land, and against the inhabitants thereof, and against all these nations
round about, and will utterly destroy them, and make them an astonishment, and
an hissing, and perpetual desolations.
10 Moreover I will take from them the voice of mirth, and the voice of gladness,
the voice of the bridegroom, and the voice of the bride, the sound of the
millstones, and the light of the candle.
11 And this whole land shall be a desolation, and an astonishment; and these
nations shall serve the king of Babylon seventy years.”
In this example, God increased the number 7 ten times to arrive at 70 years. The
number 70 can be multiplied to reveal other numbers in the Bible such as
70x7=490.