
When you ask "What number is halfway between 84 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=84 and Y=204.

To find the number halfway between 84 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 204 into our formula, we get:
(84 + 204)/2 = 144
Thus, the number halfway between 84 and 204 is 144.
To check that our answer is correct, we subtract 84 from 144 and subtract 144 from 204 and compare the two numbers:
144 - 84 = 60
204 - 144 = 60
As you can see, the halfway number is 60 higher than 84 and 60 lower than 204. Therefore, our halfway between answer of 144 above is correct.
Halfway Between
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Halfway Between 84 and 205
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