When you ask "What number is halfway between 11 and 221?" 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=221.
To find the number halfway between 11 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 221 into our formula, we get:
(11 + 221)/2 = 116
Thus, the number halfway between 11 and 221 is 116.
To check that our answer is correct, we subtract 11 from 116 and subtract 116 from 221 and compare the two numbers:
116 - 11 = 105
221 - 116 = 105
As you can see, the halfway number is 105 higher than 11 and 105 lower than 221. Therefore, our halfway between answer of 116 above is correct.
Halfway Between
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Halfway Between 11 and 222
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