When you ask "What number is halfway between 9 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=9 and Y=209.
To find the number halfway between 9 and 209, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 209 into our formula, we get:
(9 + 209)/2 = 109
Thus, the number halfway between 9 and 209 is 109.
To check that our answer is correct, we subtract 9 from 109 and subtract 109 from 209 and compare the two numbers:
109 - 9 = 100
209 - 109 = 100
As you can see, the halfway number is 100 higher than 9 and 100 lower than 209. Therefore, our halfway between answer of 109 above is correct.
Halfway Between
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Halfway Between 9 and 210
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