When you ask "What number is halfway between 9 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=9 and Y=109.
To find the number halfway between 9 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 109 into our formula, we get:
(9 + 109)/2 = 59
Thus, the number halfway between 9 and 109 is 59.
To check that our answer is correct, we subtract 9 from 59 and subtract 59 from 109 and compare the two numbers:
59 - 9 = 50
109 - 59 = 50
As you can see, the halfway number is 50 higher than 9 and 50 lower than 109. Therefore, our halfway between answer of 59 above is correct.
Halfway Between
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Halfway Between 9 and 110
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