When you ask "What number is halfway between 11 and 638?" 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=638.
To find the number halfway between 11 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 638 into our formula, we get:
(11 + 638)/2 = 324.5
Thus, the number halfway between 11 and 638 is 324.5.
To check that our answer is correct, we subtract 11 from 324.5 and subtract 324.5 from 638 and compare the two numbers:
324.5 - 11 = 313.5
638 - 324.5 = 313.5
As you can see, the halfway number is 313.5 higher than 11 and 313.5 lower than 638. Therefore, our halfway between answer of 324.5 above is correct.
Halfway Between
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Halfway Between 11 and 639
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