
When you ask "What number is halfway between 40 and 125?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=40 and Y=125.

To find the number halfway between 40 and 125, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 125 into our formula, we get:
(40 + 125)/2 = 82.5
Thus, the number halfway between 40 and 125 is 82.5.
To check that our answer is correct, we subtract 40 from 82.5 and subtract 82.5 from 125 and compare the two numbers:
82.5 - 40 = 42.5
125 - 82.5 = 42.5
As you can see, the halfway number is 42.5 higher than 40 and 42.5 lower than 125. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 40 and 126
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