
When you ask "What number is halfway between 15 and 448?" 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=448.

To find the number halfway between 15 and 448, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 448 into our formula, we get:
(15 + 448)/2 = 231.5
Thus, the number halfway between 15 and 448 is 231.5.
To check that our answer is correct, we subtract 15 from 231.5 and subtract 231.5 from 448 and compare the two numbers:
231.5 - 15 = 216.5
448 - 231.5 = 216.5
As you can see, the halfway number is 216.5 higher than 15 and 216.5 lower than 448. Therefore, our halfway between answer of 231.5 above is correct.
Halfway Between
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Halfway Between 15 and 449
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