When you ask "What number is halfway between 91 and 158?" 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=158.
To find the number halfway between 91 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 158 into our formula, we get:
(91 + 158)/2 = 124.5
Thus, the number halfway between 91 and 158 is 124.5.
To check that our answer is correct, we subtract 91 from 124.5 and subtract 124.5 from 158 and compare the two numbers:
124.5 - 91 = 33.5
158 - 124.5 = 33.5
As you can see, the halfway number is 33.5 higher than 91 and 33.5 lower than 158. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 91 and 159
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