
When you ask "What number is halfway between 15 and 602?" 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=602.

To find the number halfway between 15 and 602, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 602 into our formula, we get:
(15 + 602)/2 = 308.5
Thus, the number halfway between 15 and 602 is 308.5.
To check that our answer is correct, we subtract 15 from 308.5 and subtract 308.5 from 602 and compare the two numbers:
308.5 - 15 = 293.5
602 - 308.5 = 293.5
As you can see, the halfway number is 293.5 higher than 15 and 293.5 lower than 602. Therefore, our halfway between answer of 308.5 above is correct.
Halfway Between
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