When you ask "What number is halfway between 18 and 327?" 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=327.
To find the number halfway between 18 and 327, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 327 into our formula, we get:
(18 + 327)/2 = 172.5
Thus, the number halfway between 18 and 327 is 172.5.
To check that our answer is correct, we subtract 18 from 172.5 and subtract 172.5 from 327 and compare the two numbers:
172.5 - 18 = 154.5
327 - 172.5 = 154.5
As you can see, the halfway number is 154.5 higher than 18 and 154.5 lower than 327. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 18 and 328
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