When you ask "What number is halfway between 25 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=25 and Y=518.
To find the number halfway between 25 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 518 into our formula, we get:
(25 + 518)/2 = 271.5
Thus, the number halfway between 25 and 518 is 271.5.
To check that our answer is correct, we subtract 25 from 271.5 and subtract 271.5 from 518 and compare the two numbers:
271.5 - 25 = 246.5
518 - 271.5 = 246.5
As you can see, the halfway number is 246.5 higher than 25 and 246.5 lower than 518. Therefore, our halfway between answer of 271.5 above is correct.
Halfway Between
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Halfway Between 25 and 519
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