When you ask "What number is halfway between 91 and 123?" 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=123.
To find the number halfway between 91 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 123 into our formula, we get:
(91 + 123)/2 = 107
Thus, the number halfway between 91 and 123 is 107.
To check that our answer is correct, we subtract 91 from 107 and subtract 107 from 123 and compare the two numbers:
107 - 91 = 16
123 - 107 = 16
As you can see, the halfway number is 16 higher than 91 and 16 lower than 123. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 91 and 124
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