
When you ask "What number is halfway between 11 and 624?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=624.

To find the number halfway between 11 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 624 into our formula, we get:
(11 + 624)/2 = 317.5
Thus, the number halfway between 11 and 624 is 317.5.
To check that our answer is correct, we subtract 11 from 317.5 and subtract 317.5 from 624 and compare the two numbers:
317.5 - 11 = 306.5
624 - 317.5 = 306.5
As you can see, the halfway number is 306.5 higher than 11 and 306.5 lower than 624. Therefore, our halfway between answer of 317.5 above is correct.
Halfway Between
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Halfway Between 11 and 625
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