When you ask "What number is halfway between 18 and 523?" 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=523.
To find the number halfway between 18 and 523, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 523 into our formula, we get:
(18 + 523)/2 = 270.5
Thus, the number halfway between 18 and 523 is 270.5.
To check that our answer is correct, we subtract 18 from 270.5 and subtract 270.5 from 523 and compare the two numbers:
270.5 - 18 = 252.5
523 - 270.5 = 252.5
As you can see, the halfway number is 252.5 higher than 18 and 252.5 lower than 523. Therefore, our halfway between answer of 270.5 above is correct.
Halfway Between
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Halfway Between 18 and 524
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