When you ask "What number is halfway between 28 and 723?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=28 and Y=723.
To find the number halfway between 28 and 723, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 723 into our formula, we get:
(28 + 723)/2 = 375.5
Thus, the number halfway between 28 and 723 is 375.5.
To check that our answer is correct, we subtract 28 from 375.5 and subtract 375.5 from 723 and compare the two numbers:
375.5 - 28 = 347.5
723 - 375.5 = 347.5
As you can see, the halfway number is 347.5 higher than 28 and 347.5 lower than 723. Therefore, our halfway between answer of 375.5 above is correct.
Halfway Between
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Halfway Between 28 and 724
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