When you ask "What number is halfway between 18 and 239?" 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=239.
To find the number halfway between 18 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 239 into our formula, we get:
(18 + 239)/2 = 128.5
Thus, the number halfway between 18 and 239 is 128.5.
To check that our answer is correct, we subtract 18 from 128.5 and subtract 128.5 from 239 and compare the two numbers:
128.5 - 18 = 110.5
239 - 128.5 = 110.5
As you can see, the halfway number is 110.5 higher than 18 and 110.5 lower than 239. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 18 and 240
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