When you ask "What number is halfway between 100 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=100 and Y=723.
To find the number halfway between 100 and 723, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 723 into our formula, we get:
(100 + 723)/2 = 411.5
Thus, the number halfway between 100 and 723 is 411.5.
To check that our answer is correct, we subtract 100 from 411.5 and subtract 411.5 from 723 and compare the two numbers:
411.5 - 100 = 311.5
723 - 411.5 = 311.5
As you can see, the halfway number is 311.5 higher than 100 and 311.5 lower than 723. Therefore, our halfway between answer of 411.5 above is correct.
Halfway Between
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Halfway Between 100 and 724
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