
When you ask "What number is halfway between 75 and 720?" 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=720.

To find the number halfway between 75 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 720 into our formula, we get:
(75 + 720)/2 = 397.5
Thus, the number halfway between 75 and 720 is 397.5.
To check that our answer is correct, we subtract 75 from 397.5 and subtract 397.5 from 720 and compare the two numbers:
397.5 - 75 = 322.5
720 - 397.5 = 322.5
As you can see, the halfway number is 322.5 higher than 75 and 322.5 lower than 720. Therefore, our halfway between answer of 397.5 above is correct.
Halfway Between
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