When you ask "What number is halfway between 91 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=91 and Y=109.
To find the number halfway between 91 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 109 into our formula, we get:
(91 + 109)/2 = 100
Thus, the number halfway between 91 and 109 is 100.
To check that our answer is correct, we subtract 91 from 100 and subtract 100 from 109 and compare the two numbers:
100 - 91 = 9
109 - 100 = 9
As you can see, the halfway number is 9 higher than 91 and 9 lower than 109. Therefore, our halfway between answer of 100 above is correct.
Halfway Between
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Halfway Between 91 and 110
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