When you ask "What number is halfway between 11 and 770?" 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=770.
To find the number halfway between 11 and 770, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 770 into our formula, we get:
(11 + 770)/2 = 390.5
Thus, the number halfway between 11 and 770 is 390.5.
To check that our answer is correct, we subtract 11 from 390.5 and subtract 390.5 from 770 and compare the two numbers:
390.5 - 11 = 379.5
770 - 390.5 = 379.5
As you can see, the halfway number is 379.5 higher than 11 and 379.5 lower than 770. Therefore, our halfway between answer of 390.5 above is correct.
Halfway Between
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Halfway Between 11 and 771
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