When you ask "What number is halfway between 30 and 721?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=721.
To find the number halfway between 30 and 721, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 721 into our formula, we get:
(30 + 721)/2 = 375.5
Thus, the number halfway between 30 and 721 is 375.5.
To check that our answer is correct, we subtract 30 from 375.5 and subtract 375.5 from 721 and compare the two numbers:
375.5 - 30 = 345.5
721 - 375.5 = 345.5
As you can see, the halfway number is 345.5 higher than 30 and 345.5 lower than 721. Therefore, our halfway between answer of 375.5 above is correct.
Halfway Between
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Halfway Between 30 and 722
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