
When you ask "What number is halfway between 15 and 323?" 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=323.

To find the number halfway between 15 and 323, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 323 into our formula, we get:
(15 + 323)/2 = 169
Thus, the number halfway between 15 and 323 is 169.
To check that our answer is correct, we subtract 15 from 169 and subtract 169 from 323 and compare the two numbers:
169 - 15 = 154
323 - 169 = 154
As you can see, the halfway number is 154 higher than 15 and 154 lower than 323. Therefore, our halfway between answer of 169 above is correct.
Halfway Between
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Halfway Between 15 and 324
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