
When you ask "What number is halfway between 40 and 238?" 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=238.

To find the number halfway between 40 and 238, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 238 into our formula, we get:
(40 + 238)/2 = 139
Thus, the number halfway between 40 and 238 is 139.
To check that our answer is correct, we subtract 40 from 139 and subtract 139 from 238 and compare the two numbers:
139 - 40 = 99
238 - 139 = 99
As you can see, the halfway number is 99 higher than 40 and 99 lower than 238. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 40 and 239
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