
When you ask "What number is halfway between 13 and 872?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=13 and Y=872.

To find the number halfway between 13 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 872 into our formula, we get:
(13 + 872)/2 = 442.5
Thus, the number halfway between 13 and 872 is 442.5.
To check that our answer is correct, we subtract 13 from 442.5 and subtract 442.5 from 872 and compare the two numbers:
442.5 - 13 = 429.5
872 - 442.5 = 429.5
As you can see, the halfway number is 429.5 higher than 13 and 429.5 lower than 872. Therefore, our halfway between answer of 442.5 above is correct.
Halfway Between
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Halfway Between 13 and 873
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