When you ask "What number is halfway between 70 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=70 and Y=173.
To find the number halfway between 70 and 173, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 173 into our formula, we get:
(70 + 173)/2 = 121.5
Thus, the number halfway between 70 and 173 is 121.5.
To check that our answer is correct, we subtract 70 from 121.5 and subtract 121.5 from 173 and compare the two numbers:
121.5 - 70 = 51.5
173 - 121.5 = 51.5
As you can see, the halfway number is 51.5 higher than 70 and 51.5 lower than 173. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 70 and 174
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