When you ask "What number is halfway between 9 and 91?" 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=91.
To find the number halfway between 9 and 91, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 91 into our formula, we get:
(9 + 91)/2 = 50
Thus, the number halfway between 9 and 91 is 50.
To check that our answer is correct, we subtract 9 from 50 and subtract 50 from 91 and compare the two numbers:
50 - 9 = 41
91 - 50 = 41
As you can see, the halfway number is 41 higher than 9 and 41 lower than 91. Therefore, our halfway between answer of 50 above is correct.
Halfway Between
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Halfway Between 9 and 92
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