When you ask "What number is halfway between 11 and 772?" 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=772.
To find the number halfway between 11 and 772, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 772 into our formula, we get:
(11 + 772)/2 = 391.5
Thus, the number halfway between 11 and 772 is 391.5.
To check that our answer is correct, we subtract 11 from 391.5 and subtract 391.5 from 772 and compare the two numbers:
391.5 - 11 = 380.5
772 - 391.5 = 380.5
As you can see, the halfway number is 380.5 higher than 11 and 380.5 lower than 772. Therefore, our halfway between answer of 391.5 above is correct.
Halfway Between
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Halfway Between 11 and 773
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