When you ask "What number is halfway between 11 and 216?" 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=216.
To find the number halfway between 11 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 216 into our formula, we get:
(11 + 216)/2 = 113.5
Thus, the number halfway between 11 and 216 is 113.5.
To check that our answer is correct, we subtract 11 from 113.5 and subtract 113.5 from 216 and compare the two numbers:
113.5 - 11 = 102.5
216 - 113.5 = 102.5
As you can see, the halfway number is 102.5 higher than 11 and 102.5 lower than 216. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 11 and 217
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