When you ask "What number is halfway between 91 and 178?" 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=178.
To find the number halfway between 91 and 178, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 178 into our formula, we get:
(91 + 178)/2 = 134.5
Thus, the number halfway between 91 and 178 is 134.5.
To check that our answer is correct, we subtract 91 from 134.5 and subtract 134.5 from 178 and compare the two numbers:
134.5 - 91 = 43.5
178 - 134.5 = 43.5
As you can see, the halfway number is 43.5 higher than 91 and 43.5 lower than 178. Therefore, our halfway between answer of 134.5 above is correct.
Halfway Between
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Halfway Between 91 and 179
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