When you ask "What number is halfway between 11 and 642?" 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=642.
To find the number halfway between 11 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 642 into our formula, we get:
(11 + 642)/2 = 326.5
Thus, the number halfway between 11 and 642 is 326.5.
To check that our answer is correct, we subtract 11 from 326.5 and subtract 326.5 from 642 and compare the two numbers:
326.5 - 11 = 315.5
642 - 326.5 = 315.5
As you can see, the halfway number is 315.5 higher than 11 and 315.5 lower than 642. Therefore, our halfway between answer of 326.5 above is correct.
Halfway Between
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Halfway Between 11 and 643
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