When you ask "What number is halfway between 18 and 487?" 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=487.
To find the number halfway between 18 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 487 into our formula, we get:
(18 + 487)/2 = 252.5
Thus, the number halfway between 18 and 487 is 252.5.
To check that our answer is correct, we subtract 18 from 252.5 and subtract 252.5 from 487 and compare the two numbers:
252.5 - 18 = 234.5
487 - 252.5 = 234.5
As you can see, the halfway number is 234.5 higher than 18 and 234.5 lower than 487. Therefore, our halfway between answer of 252.5 above is correct.
Halfway Between
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Halfway Between 18 and 488
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