The number is 250.5 because it is exactly 249.5 from either 1 or 500.
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350
The distance between 1 and .5 is (1 - .5)/2 which is .25. Add that to .5 to get the number halfway between the points: .5 + .25 = .75.So the point halfway between is .75 or 3/4.
51
0.05
The halfway number is 1/2*(750000 + 1000000) = 1/2*1750000 = 875000