
When you ask "What number is halfway between 8 and 109?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=109.

To find the number halfway between 8 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 109 into our formula, we get:
(8 + 109)/2 = 58.5
Thus, the number halfway between 8 and 109 is 58.5.
To check that our answer is correct, we subtract 8 from 58.5 and subtract 58.5 from 109 and compare the two numbers:
58.5 - 8 = 50.5
109 - 58.5 = 50.5
As you can see, the halfway number is 50.5 higher than 8 and 50.5 lower than 109. Therefore, our halfway between answer of 58.5 above is correct.
Halfway Between
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Halfway Between 8 and 110
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