When you ask "What number is halfway between 9 and 199?" 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=199.
To find the number halfway between 9 and 199, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 199 into our formula, we get:
(9 + 199)/2 = 104
Thus, the number halfway between 9 and 199 is 104.
To check that our answer is correct, we subtract 9 from 104 and subtract 104 from 199 and compare the two numbers:
104 - 9 = 95
199 - 104 = 95
As you can see, the halfway number is 95 higher than 9 and 95 lower than 199. Therefore, our halfway between answer of 104 above is correct.
Halfway Between
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Halfway Between 9 and 200
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