When you ask "What number is halfway between 21 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=21 and Y=204.
To find the number halfway between 21 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 204 into our formula, we get:
(21 + 204)/2 = 112.5
Thus, the number halfway between 21 and 204 is 112.5.
To check that our answer is correct, we subtract 21 from 112.5 and subtract 112.5 from 204 and compare the two numbers:
112.5 - 21 = 91.5
204 - 112.5 = 91.5
As you can see, the halfway number is 91.5 higher than 21 and 91.5 lower than 204. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 21 and 205
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