When you ask "What number is halfway between 11 and 637?" 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=637.
To find the number halfway between 11 and 637, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 637 into our formula, we get:
(11 + 637)/2 = 324
Thus, the number halfway between 11 and 637 is 324.
To check that our answer is correct, we subtract 11 from 324 and subtract 324 from 637 and compare the two numbers:
324 - 11 = 313
637 - 324 = 313
As you can see, the halfway number is 313 higher than 11 and 313 lower than 637. Therefore, our halfway between answer of 324 above is correct.
Halfway Between
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Halfway Between 11 and 638
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