When you ask "What number is halfway between 18 and 397?" 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=397.
To find the number halfway between 18 and 397, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 397 into our formula, we get:
(18 + 397)/2 = 207.5
Thus, the number halfway between 18 and 397 is 207.5.
To check that our answer is correct, we subtract 18 from 207.5 and subtract 207.5 from 397 and compare the two numbers:
207.5 - 18 = 189.5
397 - 207.5 = 189.5
As you can see, the halfway number is 189.5 higher than 18 and 189.5 lower than 397. Therefore, our halfway between answer of 207.5 above is correct.
Halfway Between
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Halfway Between 18 and 398
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