When you ask "What number is halfway between 11 and 209?" 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=209.
To find the number halfway between 11 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 209 into our formula, we get:
(11 + 209)/2 = 110
Thus, the number halfway between 11 and 209 is 110.
To check that our answer is correct, we subtract 11 from 110 and subtract 110 from 209 and compare the two numbers:
110 - 11 = 99
209 - 110 = 99
As you can see, the halfway number is 99 higher than 11 and 99 lower than 209. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 11 and 210
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