When you ask "What number is halfway between 9 and 200?" 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=200.
To find the number halfway between 9 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 200 into our formula, we get:
(9 + 200)/2 = 104.5
Thus, the number halfway between 9 and 200 is 104.5.
To check that our answer is correct, we subtract 9 from 104.5 and subtract 104.5 from 200 and compare the two numbers:
104.5 - 9 = 95.5
200 - 104.5 = 95.5
As you can see, the halfway number is 95.5 higher than 9 and 95.5 lower than 200. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 9 and 201
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