
When you ask "What number is halfway between 40 and 204?" 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=204.

To find the number halfway between 40 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 204 into our formula, we get:
(40 + 204)/2 = 122
Thus, the number halfway between 40 and 204 is 122.
To check that our answer is correct, we subtract 40 from 122 and subtract 122 from 204 and compare the two numbers:
122 - 40 = 82
204 - 122 = 82
As you can see, the halfway number is 82 higher than 40 and 82 lower than 204. Therefore, our halfway between answer of 122 above is correct.
Halfway Between
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Halfway Between 40 and 205
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