When you ask "What number is halfway between 91 and 139?" 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=139.
To find the number halfway between 91 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 139 into our formula, we get:
(91 + 139)/2 = 115
Thus, the number halfway between 91 and 139 is 115.
To check that our answer is correct, we subtract 91 from 115 and subtract 115 from 139 and compare the two numbers:
115 - 91 = 24
139 - 115 = 24
As you can see, the halfway number is 24 higher than 91 and 24 lower than 139. Therefore, our halfway between answer of 115 above is correct.
Halfway Between
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Halfway Between 91 and 140
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