When you ask "What number is halfway between 27 and 518?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=27 and Y=518.
To find the number halfway between 27 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 518 into our formula, we get:
(27 + 518)/2 = 272.5
Thus, the number halfway between 27 and 518 is 272.5.
To check that our answer is correct, we subtract 27 from 272.5 and subtract 272.5 from 518 and compare the two numbers:
272.5 - 27 = 245.5
518 - 272.5 = 245.5
As you can see, the halfway number is 245.5 higher than 27 and 245.5 lower than 518. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 27 and 519
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