
When you ask "What number is halfway between 24 and 321?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=24 and Y=321.

To find the number halfway between 24 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 24 and 321 into our formula, we get:
(24 + 321)/2 = 172.5
Thus, the number halfway between 24 and 321 is 172.5.
To check that our answer is correct, we subtract 24 from 172.5 and subtract 172.5 from 321 and compare the two numbers:
172.5 - 24 = 148.5
321 - 172.5 = 148.5
As you can see, the halfway number is 148.5 higher than 24 and 148.5 lower than 321. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 24 and 322
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