When you ask "What number is halfway between 18 and 207?" 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=207.
To find the number halfway between 18 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 207 into our formula, we get:
(18 + 207)/2 = 112.5
Thus, the number halfway between 18 and 207 is 112.5.
To check that our answer is correct, we subtract 18 from 112.5 and subtract 112.5 from 207 and compare the two numbers:
112.5 - 18 = 94.5
207 - 112.5 = 94.5
As you can see, the halfway number is 94.5 higher than 18 and 94.5 lower than 207. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 18 and 208
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