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.
Joshua 24:1-3
1
Joshua gathered all the tribes of Israel to Shechem, and called for the elders of Israel, for their heads, for their judges, and for their officers; and they presented themselves before God.
2
Joshua said to all the people, "Thus says Yahweh, the God of Israel, 'Your fathers lived of old time beyond the River, even Terah, the father of Abraham, and the father of Nahor: and they served other gods.
3
I took your father Abraham from beyond the River, and led him throughout all the land of Canaan, and multiplied his seed, and gave him Isaac.
