When you ask "What number is halfway between 99 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=99 and Y=204.
To find the number halfway between 99 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 204 into our formula, we get:
(99 + 204)/2 = 151.5
Thus, the number halfway between 99 and 204 is 151.5.
To check that our answer is correct, we subtract 99 from 151.5 and subtract 151.5 from 204 and compare the two numbers:
151.5 - 99 = 52.5
204 - 151.5 = 52.5
As you can see, the halfway number is 52.5 higher than 99 and 52.5 lower than 204. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 99 and 205
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