When you ask "What number is halfway between 91 and 131?" 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=131.
To find the number halfway between 91 and 131, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 131 into our formula, we get:
(91 + 131)/2 = 111
Thus, the number halfway between 91 and 131 is 111.
To check that our answer is correct, we subtract 91 from 111 and subtract 111 from 131 and compare the two numbers:
111 - 91 = 20
131 - 111 = 20
As you can see, the halfway number is 20 higher than 91 and 20 lower than 131. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 91 and 132
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