When you ask "What number is halfway between 40 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=40 and Y=173.
To find the number halfway between 40 and 173, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 173 into our formula, we get:
(40 + 173)/2 = 106.5
Thus, the number halfway between 40 and 173 is 106.5.
To check that our answer is correct, we subtract 40 from 106.5 and subtract 106.5 from 173 and compare the two numbers:
106.5 - 40 = 66.5
173 - 106.5 = 66.5
As you can see, the halfway number is 66.5 higher than 40 and 66.5 lower than 173. Therefore, our halfway between answer of 106.5 above is correct.
Halfway Between
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Halfway Between 40 and 174
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