
When you ask "What number is halfway between 15 and 325?" 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=325.

To find the number halfway between 15 and 325, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 325 into our formula, we get:
(15 + 325)/2 = 170
Thus, the number halfway between 15 and 325 is 170.
To check that our answer is correct, we subtract 15 from 170 and subtract 170 from 325 and compare the two numbers:
170 - 15 = 155
325 - 170 = 155
As you can see, the halfway number is 155 higher than 15 and 155 lower than 325. Therefore, our halfway between answer of 170 above is correct.
Halfway Between
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Halfway Between 15 and 326
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