
When you ask "What number is halfway between 4 and 173?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=173.

To find the number halfway between 4 and 173, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 173 into our formula, we get:
(4 + 173)/2 = 88.5
Thus, the number halfway between 4 and 173 is 88.5.
To check that our answer is correct, we subtract 4 from 88.5 and subtract 88.5 from 173 and compare the two numbers:
88.5 - 4 = 84.5
173 - 88.5 = 84.5
As you can see, the halfway number is 84.5 higher than 4 and 84.5 lower than 173. Therefore, our halfway between answer of 88.5 above is correct.
Halfway Between
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Halfway Between 4 and 174
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