
When you ask "What number is halfway between 5 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=5 and Y=178.

To find the number halfway between 5 and 178, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 178 into our formula, we get:
(5 + 178)/2 = 91.5
Thus, the number halfway between 5 and 178 is 91.5.
To check that our answer is correct, we subtract 5 from 91.5 and subtract 91.5 from 178 and compare the two numbers:
91.5 - 5 = 86.5
178 - 91.5 = 86.5
As you can see, the halfway number is 86.5 higher than 5 and 86.5 lower than 178. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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Halfway Between 5 and 179
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