When you ask "What number is halfway between 11 and 810?" 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=810.
To find the number halfway between 11 and 810, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 810 into our formula, we get:
(11 + 810)/2 = 410.5
Thus, the number halfway between 11 and 810 is 410.5.
To check that our answer is correct, we subtract 11 from 410.5 and subtract 410.5 from 810 and compare the two numbers:
410.5 - 11 = 399.5
810 - 410.5 = 399.5
As you can see, the halfway number is 399.5 higher than 11 and 399.5 lower than 810. Therefore, our halfway between answer of 410.5 above is correct.
Halfway Between
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Halfway Between 11 and 811
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