
When you ask "What number is halfway between 91 and 225?" 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=225.

To find the number halfway between 91 and 225, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 225 into our formula, we get:
(91 + 225)/2 = 158
Thus, the number halfway between 91 and 225 is 158.
To check that our answer is correct, we subtract 91 from 158 and subtract 158 from 225 and compare the two numbers:
158 - 91 = 67
225 - 158 = 67
As you can see, the halfway number is 67 higher than 91 and 67 lower than 225. Therefore, our halfway between answer of 158 above is correct.
Halfway Between
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Halfway Between 91 and 226
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