When you ask "What number is halfway between 18 and 271?" 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=271.
To find the number halfway between 18 and 271, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 271 into our formula, we get:
(18 + 271)/2 = 144.5
Thus, the number halfway between 18 and 271 is 144.5.
To check that our answer is correct, we subtract 18 from 144.5 and subtract 144.5 from 271 and compare the two numbers:
144.5 - 18 = 126.5
271 - 144.5 = 126.5
As you can see, the halfway number is 126.5 higher than 18 and 126.5 lower than 271. Therefore, our halfway between answer of 144.5 above is correct.
Halfway Between
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Halfway Between 18 and 272
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