When you ask "What number is halfway between 15 and 396?" 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=396.
To find the number halfway between 15 and 396, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 396 into our formula, we get:
(15 + 396)/2 = 205.5
Thus, the number halfway between 15 and 396 is 205.5.
To check that our answer is correct, we subtract 15 from 205.5 and subtract 205.5 from 396 and compare the two numbers:
205.5 - 15 = 190.5
396 - 205.5 = 190.5
As you can see, the halfway number is 190.5 higher than 15 and 190.5 lower than 396. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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Halfway Between 15 and 397
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