
When you ask "What number is halfway between 75 and 664?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=75 and Y=664.

To find the number halfway between 75 and 664, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 664 into our formula, we get:
(75 + 664)/2 = 369.5
Thus, the number halfway between 75 and 664 is 369.5.
To check that our answer is correct, we subtract 75 from 369.5 and subtract 369.5 from 664 and compare the two numbers:
369.5 - 75 = 294.5
664 - 369.5 = 294.5
As you can see, the halfway number is 294.5 higher than 75 and 294.5 lower than 664. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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Halfway Between 75 and 665
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