When you ask "What number is halfway between 11 and 310?" 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=310.
To find the number halfway between 11 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 310 into our formula, we get:
(11 + 310)/2 = 160.5
Thus, the number halfway between 11 and 310 is 160.5.
To check that our answer is correct, we subtract 11 from 160.5 and subtract 160.5 from 310 and compare the two numbers:
160.5 - 11 = 149.5
310 - 160.5 = 149.5
As you can see, the halfway number is 149.5 higher than 11 and 149.5 lower than 310. Therefore, our halfway between answer of 160.5 above is correct.
Halfway Between
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Halfway Between 11 and 311
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