When you ask "What number is halfway between 18 and 387?" 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=387.
To find the number halfway between 18 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 387 into our formula, we get:
(18 + 387)/2 = 202.5
Thus, the number halfway between 18 and 387 is 202.5.
To check that our answer is correct, we subtract 18 from 202.5 and subtract 202.5 from 387 and compare the two numbers:
202.5 - 18 = 184.5
387 - 202.5 = 184.5
As you can see, the halfway number is 184.5 higher than 18 and 184.5 lower than 387. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 18 and 388
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