When you ask "What number is halfway between 18 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=18 and Y=209.
To find the number halfway between 18 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 209 into our formula, we get:
(18 + 209)/2 = 113.5
Thus, the number halfway between 18 and 209 is 113.5.
To check that our answer is correct, we subtract 18 from 113.5 and subtract 113.5 from 209 and compare the two numbers:
113.5 - 18 = 95.5
209 - 113.5 = 95.5
As you can see, the halfway number is 95.5 higher than 18 and 95.5 lower than 209. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 18 and 210
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