When you ask "What number is halfway between 30 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=30 and Y=173.
To find the number halfway between 30 and 173, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 173 into our formula, we get:
(30 + 173)/2 = 101.5
Thus, the number halfway between 30 and 173 is 101.5.
To check that our answer is correct, we subtract 30 from 101.5 and subtract 101.5 from 173 and compare the two numbers:
101.5 - 30 = 71.5
173 - 101.5 = 71.5
As you can see, the halfway number is 71.5 higher than 30 and 71.5 lower than 173. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 30 and 174
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