Temple Area Number - 1250

This is a prominent number in the area calculations in the Eternal Temple described in the book of Ezekiel. It is full detailed in the book
"Yahweh's Temple in Ezekiel".  The number 1240 is an increment of the number 12.50.  In the book "Yahweh's Temple in Ezekiel, it is revealed in Temple

 area measurements as:

12:50

125

1250

For example it is the area measurement for the great gates that God designed for the Eternal Temple.  For example,  in Ezekiel 40:6-15, the angel measured the east gate:
“6 Then came he unto the gate which looketh toward the east, and went up the stairs thereof, and measured the threshold of the gate, which was one reed broad; and the other threshold of the gate, which was one reed broad.

13 He measured then the gate from the roof of one little chamber to the roof of another: the breadth was five and twenty cubits, door against door.
14 He made also posts of threescore cubits, even unto the post of the court round about the gate.
15 And from the face of the gate of the entrance unto the face of the porch of the inner gate were fifty cubits.”

These are the dimensions of the east gate of the Temple.
Length of east gate 50 cubits
Width of east gate 25 cubits

Therefore, the total area of the gate is 50x25 which is 1250 cubits. This number and its increments were used by God to number various areas of the Temple (see "Yahweh's Temple in Ezekiel").