When you ask "What number is halfway between 91 and 180?" 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=180.
To find the number halfway between 91 and 180, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 180 into our formula, we get:
(91 + 180)/2 = 135.5
Thus, the number halfway between 91 and 180 is 135.5.
To check that our answer is correct, we subtract 91 from 135.5 and subtract 135.5 from 180 and compare the two numbers:
135.5 - 91 = 44.5
180 - 135.5 = 44.5
As you can see, the halfway number is 44.5 higher than 91 and 44.5 lower than 180. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 91 and 181
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