When you ask "What number is halfway between 15 and 398?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=398.
To find the number halfway between 15 and 398, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 398 into our formula, we get:
(15 + 398)/2 = 206.5
Thus, the number halfway between 15 and 398 is 206.5.
To check that our answer is correct, we subtract 15 from 206.5 and subtract 206.5 from 398 and compare the two numbers:
206.5 - 15 = 191.5
398 - 206.5 = 191.5
As you can see, the halfway number is 191.5 higher than 15 and 191.5 lower than 398. Therefore, our halfway between answer of 206.5 above is correct.
Halfway Between
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Halfway Between 15 and 399
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