When you ask "What number is halfway between 15 and 664?" 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=664.
To find the number halfway between 15 and 664, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 664 into our formula, we get:
(15 + 664)/2 = 339.5
Thus, the number halfway between 15 and 664 is 339.5.
To check that our answer is correct, we subtract 15 from 339.5 and subtract 339.5 from 664 and compare the two numbers:
339.5 - 15 = 324.5
664 - 339.5 = 324.5
As you can see, the halfway number is 324.5 higher than 15 and 324.5 lower than 664. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 15 and 665
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