When you ask "What number is halfway between 9 and 205?" 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=205.
To find the number halfway between 9 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 205 into our formula, we get:
(9 + 205)/2 = 107
Thus, the number halfway between 9 and 205 is 107.
To check that our answer is correct, we subtract 9 from 107 and subtract 107 from 205 and compare the two numbers:
107 - 9 = 98
205 - 107 = 98
As you can see, the halfway number is 98 higher than 9 and 98 lower than 205. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 9 and 206
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