When you ask "What number is halfway between 21 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=21 and Y=209.
To find the number halfway between 21 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 209 into our formula, we get:
(21 + 209)/2 = 115
Thus, the number halfway between 21 and 209 is 115.
To check that our answer is correct, we subtract 21 from 115 and subtract 115 from 209 and compare the two numbers:
115 - 21 = 94
209 - 115 = 94
As you can see, the halfway number is 94 higher than 21 and 94 lower than 209. Therefore, our halfway between answer of 115 above is correct.
Halfway Between
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Halfway Between 21 and 210
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