When you ask "What number is halfway between 11 and 800?" 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=800.
To find the number halfway between 11 and 800, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 800 into our formula, we get:
(11 + 800)/2 = 405.5
Thus, the number halfway between 11 and 800 is 405.5.
To check that our answer is correct, we subtract 11 from 405.5 and subtract 405.5 from 800 and compare the two numbers:
405.5 - 11 = 394.5
800 - 405.5 = 394.5
As you can see, the halfway number is 394.5 higher than 11 and 394.5 lower than 800. Therefore, our halfway between answer of 405.5 above is correct.
Halfway Between
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Halfway Between 11 and 801
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