When you ask "What number is halfway between 18 and 493?" 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=493.
To find the number halfway between 18 and 493, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 493 into our formula, we get:
(18 + 493)/2 = 255.5
Thus, the number halfway between 18 and 493 is 255.5.
To check that our answer is correct, we subtract 18 from 255.5 and subtract 255.5 from 493 and compare the two numbers:
255.5 - 18 = 237.5
493 - 255.5 = 237.5
As you can see, the halfway number is 237.5 higher than 18 and 237.5 lower than 493. Therefore, our halfway between answer of 255.5 above is correct.
Halfway Between
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Halfway Between 18 and 494
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