When you ask "What number is halfway between 89 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=89 and Y=109.
To find the number halfway between 89 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 109 into our formula, we get:
(89 + 109)/2 = 99
Thus, the number halfway between 89 and 109 is 99.
To check that our answer is correct, we subtract 89 from 99 and subtract 99 from 109 and compare the two numbers:
99 - 89 = 10
109 - 99 = 10
As you can see, the halfway number is 10 higher than 89 and 10 lower than 109. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 89 and 110
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