When you ask "What number is halfway between 18 and 511?" 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=511.
To find the number halfway between 18 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 511 into our formula, we get:
(18 + 511)/2 = 264.5
Thus, the number halfway between 18 and 511 is 264.5.
To check that our answer is correct, we subtract 18 from 264.5 and subtract 264.5 from 511 and compare the two numbers:
264.5 - 18 = 246.5
511 - 264.5 = 246.5
As you can see, the halfway number is 246.5 higher than 18 and 246.5 lower than 511. Therefore, our halfway between answer of 264.5 above is correct.
Halfway Between
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Halfway Between 18 and 512
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