One. that is the definition of a line.
Through any two points, there is exactly one line.
If you were to round it upwards, it would be 12. :)
So basically, these numbers have to be consecutive because they're facing pages.
So you can just divide this by 2, and then add one to the second number.
629/2 = 314 R1
So the first page number is 314, and for the second one, just add one, and you get 315.
U can round 289 to 290 and round 7 to 5 or 10
