When you ask "What number is halfway between 18 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=18 and Y=204.
To find the number halfway between 18 and 204, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 204 into our formula, we get:
(18 + 204)/2 = 111
Thus, the number halfway between 18 and 204 is 111.
To check that our answer is correct, we subtract 18 from 111 and subtract 111 from 204 and compare the two numbers:
111 - 18 = 93
204 - 111 = 93
As you can see, the halfway number is 93 higher than 18 and 93 lower than 204. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 18 and 205
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