Hundred
It's a landmark for a young child to count to 100; it sort of covers all the "ordinary" numbers. One hundred is obviously significant for other groupings: 100 cents is a dollar; 100 yards is a touchdown; 100 years is a century, and the landmark for a very long life. It makes sense, then, that in the Bible, 100 represents fullness or a state of completion, or in some instances simply "much." For instance, people marvel that Abraham had Isaac when he was 100 years old; the number represents the point at which the Lord, when growing up as Jesus, united the human elements of himself with the divine elements and in a sense became "complete.
Genesis 28:10-13
10
Jacob went out from Beersheba, and went toward Haran.
11
He came to a certain place, and stayed there all night, because the sun had set. He took one of the stones of the place, and put it under his head, and lay down in that place to sleep.
12
He dreamed. Behold, a stairway set upon the earth, and its top reached to heaven. Behold, the angels of God ascending and descending on it.
13
Behold, Yahweh stood above it, and said, "I am Yahweh, the God of Abraham your father, and the God of Isaac. The land whereon you lie, to you will I give it, and to your seed.
