
When you ask "What number is halfway between 15 and 258?" 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=258.

To find the number halfway between 15 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 258 into our formula, we get:
(15 + 258)/2 = 136.5
Thus, the number halfway between 15 and 258 is 136.5.
To check that our answer is correct, we subtract 15 from 136.5 and subtract 136.5 from 258 and compare the two numbers:
136.5 - 15 = 121.5
258 - 136.5 = 121.5
As you can see, the halfway number is 121.5 higher than 15 and 121.5 lower than 258. Therefore, our halfway between answer of 136.5 above is correct.
Halfway Between
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Halfway Between 15 and 259
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