When you ask "What number is halfway between 91 and 129?" 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=129.
To find the number halfway between 91 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 129 into our formula, we get:
(91 + 129)/2 = 110
Thus, the number halfway between 91 and 129 is 110.
To check that our answer is correct, we subtract 91 from 110 and subtract 110 from 129 and compare the two numbers:
110 - 91 = 19
129 - 110 = 19
As you can see, the halfway number is 19 higher than 91 and 19 lower than 129. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 91 and 130
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