When you ask "What number is halfway between 18 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=18 and Y=518.
To find the number halfway between 18 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 518 into our formula, we get:
(18 + 518)/2 = 268
Thus, the number halfway between 18 and 518 is 268.
To check that our answer is correct, we subtract 18 from 268 and subtract 268 from 518 and compare the two numbers:
268 - 18 = 250
518 - 268 = 250
As you can see, the halfway number is 250 higher than 18 and 250 lower than 518. Therefore, our halfway between answer of 268 above is correct.
Halfway Between
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Halfway Between 18 and 519
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