When you ask "What number is halfway between 18 and 491?" 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=491.
To find the number halfway between 18 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 491 into our formula, we get:
(18 + 491)/2 = 254.5
Thus, the number halfway between 18 and 491 is 254.5.
To check that our answer is correct, we subtract 18 from 254.5 and subtract 254.5 from 491 and compare the two numbers:
254.5 - 18 = 236.5
491 - 254.5 = 236.5
As you can see, the halfway number is 236.5 higher than 18 and 236.5 lower than 491. Therefore, our halfway between answer of 254.5 above is correct.
Halfway Between
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Halfway Between 18 and 492
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