When you ask "What number is halfway between 11 and 860?" 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=860.
To find the number halfway between 11 and 860, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 860 into our formula, we get:
(11 + 860)/2 = 435.5
Thus, the number halfway between 11 and 860 is 435.5.
To check that our answer is correct, we subtract 11 from 435.5 and subtract 435.5 from 860 and compare the two numbers:
435.5 - 11 = 424.5
860 - 435.5 = 424.5
As you can see, the halfway number is 424.5 higher than 11 and 424.5 lower than 860. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 11 and 861
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