The narrator emphasises the arithmetic — four against five — to highlight that the outcome will not be determined by numbers alone. Chedorlaomer's alliance, despite being smaller in number of kings, had the superior military machine. This also underlines the apparent hopelessness of the situation for the five kings — and for Lot.
Memory phrase: God is not limited by numbers or odds.
Talk about it: Four kings beat five — even though they were outnumbered! Can you think of other stories where the smaller side won?
Prayer: God, help me remember that You don't need big numbers to win. You just need to be on our side.