Mark 6:40

Overview - Mark 6
Christ is contemned of his countrymen.
He gives the twelve power over unclean spirits.
14 Divers opinions of Christ.
16 John the Baptist is imprisoned, beheaded, and buried.
30 The apostles return from preaching.
34 The miracle of five loaves and two fishes.
45 Christ walks on the sea;
53 and heals all that touch him.
Treasury of Scripture Knowledge

Mark 6:40  (King James Version)
And they sat down in ranks, by hundreds, and by fifties.

by hundreds
It is generally supposed that they were so arranged as to be a hundred in rank, or depth, and fifty in front, or file; which would make the number just five thousand, and will reconcile this account with Luke's, who only speaks of their sitting down by fifties.
Luke 9:14 Luke 9:15