When you ask "What number is halfway between 84 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=84 and Y=721.
To find the number halfway between 84 and 721, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 721 into our formula, we get:
(84 + 721)/2 = 402.5
Thus, the number halfway between 84 and 721 is 402.5.
To check that our answer is correct, we subtract 84 from 402.5 and subtract 402.5 from 721 and compare the two numbers:
402.5 - 84 = 318.5
721 - 402.5 = 318.5
As you can see, the halfway number is 318.5 higher than 84 and 318.5 lower than 721. Therefore, our halfway between answer of 402.5 above is correct.
Halfway Between
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Halfway Between 84 and 722
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