
When you ask "What number is halfway between 11 and 634?" 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=634.

To find the number halfway between 11 and 634, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 634 into our formula, we get:
(11 + 634)/2 = 322.5
Thus, the number halfway between 11 and 634 is 322.5.
To check that our answer is correct, we subtract 11 from 322.5 and subtract 322.5 from 634 and compare the two numbers:
322.5 - 11 = 311.5
634 - 322.5 = 311.5
As you can see, the halfway number is 311.5 higher than 11 and 311.5 lower than 634. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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Halfway Between 11 and 635
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