When you ask "What number is halfway between 18 and 385?" 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=385.
To find the number halfway between 18 and 385, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 385 into our formula, we get:
(18 + 385)/2 = 201.5
Thus, the number halfway between 18 and 385 is 201.5.
To check that our answer is correct, we subtract 18 from 201.5 and subtract 201.5 from 385 and compare the two numbers:
201.5 - 18 = 183.5
385 - 201.5 = 183.5
As you can see, the halfway number is 183.5 higher than 18 and 183.5 lower than 385. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 18 and 386
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