When you ask "What number is halfway between 9 and 207?" 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=207.
To find the number halfway between 9 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 207 into our formula, we get:
(9 + 207)/2 = 108
Thus, the number halfway between 9 and 207 is 108.
To check that our answer is correct, we subtract 9 from 108 and subtract 108 from 207 and compare the two numbers:
108 - 9 = 99
207 - 108 = 99
As you can see, the halfway number is 99 higher than 9 and 99 lower than 207. Therefore, our halfway between answer of 108 above is correct.
Halfway Between
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Halfway Between 9 and 208
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