When you ask "What number is halfway between 18 and 265?" 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=265.
To find the number halfway between 18 and 265, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 265 into our formula, we get:
(18 + 265)/2 = 141.5
Thus, the number halfway between 18 and 265 is 141.5.
To check that our answer is correct, we subtract 18 from 141.5 and subtract 141.5 from 265 and compare the two numbers:
141.5 - 18 = 123.5
265 - 141.5 = 123.5
As you can see, the halfway number is 123.5 higher than 18 and 123.5 lower than 265. Therefore, our halfway between answer of 141.5 above is correct.
Halfway Between
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Halfway Between 18 and 266
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