When you ask "What number is halfway between 18 and 515?" 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=515.
To find the number halfway between 18 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 515 into our formula, we get:
(18 + 515)/2 = 266.5
Thus, the number halfway between 18 and 515 is 266.5.
To check that our answer is correct, we subtract 18 from 266.5 and subtract 266.5 from 515 and compare the two numbers:
266.5 - 18 = 248.5
515 - 266.5 = 248.5
As you can see, the halfway number is 248.5 higher than 18 and 248.5 lower than 515. Therefore, our halfway between answer of 266.5 above is correct.
Halfway Between
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Halfway Between 18 and 516
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