When you ask "What number is halfway between 9 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=9 and Y=204.
To find the number halfway between 9 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 204 into our formula, we get:
(9 + 204)/2 = 106.5
Thus, the number halfway between 9 and 204 is 106.5.
To check that our answer is correct, we subtract 9 from 106.5 and subtract 106.5 from 204 and compare the two numbers:
106.5 - 9 = 97.5
204 - 106.5 = 97.5
As you can see, the halfway number is 97.5 higher than 9 and 97.5 lower than 204. Therefore, our halfway between answer of 106.5 above is correct.
Halfway Between
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Halfway Between 9 and 205
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