When you ask "What number is halfway between 18 and 415?" 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=415.
To find the number halfway between 18 and 415, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 415 into our formula, we get:
(18 + 415)/2 = 216.5
Thus, the number halfway between 18 and 415 is 216.5.
To check that our answer is correct, we subtract 18 from 216.5 and subtract 216.5 from 415 and compare the two numbers:
216.5 - 18 = 198.5
415 - 216.5 = 198.5
As you can see, the halfway number is 198.5 higher than 18 and 198.5 lower than 415. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 18 and 416
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