When you ask "What number is halfway between 21 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=21 and Y=723.
To find the number halfway between 21 and 723, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 723 into our formula, we get:
(21 + 723)/2 = 372
Thus, the number halfway between 21 and 723 is 372.
To check that our answer is correct, we subtract 21 from 372 and subtract 372 from 723 and compare the two numbers:
372 - 21 = 351
723 - 372 = 351
As you can see, the halfway number is 351 higher than 21 and 351 lower than 723. Therefore, our halfway between answer of 372 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 21 and 724
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