When you ask "What number is halfway between 39 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=39 and Y=204.
To find the number halfway between 39 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 204 into our formula, we get:
(39 + 204)/2 = 121.5
Thus, the number halfway between 39 and 204 is 121.5.
To check that our answer is correct, we subtract 39 from 121.5 and subtract 121.5 from 204 and compare the two numbers:
121.5 - 39 = 82.5
204 - 121.5 = 82.5
As you can see, the halfway number is 82.5 higher than 39 and 82.5 lower than 204. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 39 and 205
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