When you ask "What number is halfway between 86 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=86 and Y=173.
To find the number halfway between 86 and 173, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 173 into our formula, we get:
(86 + 173)/2 = 129.5
Thus, the number halfway between 86 and 173 is 129.5.
To check that our answer is correct, we subtract 86 from 129.5 and subtract 129.5 from 173 and compare the two numbers:
129.5 - 86 = 43.5
173 - 129.5 = 43.5
As you can see, the halfway number is 43.5 higher than 86 and 43.5 lower than 173. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 86 and 174
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