When you ask "What number is halfway between 11 and 780?" 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=780.
To find the number halfway between 11 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 780 into our formula, we get:
(11 + 780)/2 = 395.5
Thus, the number halfway between 11 and 780 is 395.5.
To check that our answer is correct, we subtract 11 from 395.5 and subtract 395.5 from 780 and compare the two numbers:
395.5 - 11 = 384.5
780 - 395.5 = 384.5
As you can see, the halfway number is 384.5 higher than 11 and 384.5 lower than 780. Therefore, our halfway between answer of 395.5 above is correct.
Halfway Between
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