When you ask "What number is halfway between 78 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=78 and Y=721.
To find the number halfway between 78 and 721, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 721 into our formula, we get:
(78 + 721)/2 = 399.5
Thus, the number halfway between 78 and 721 is 399.5.
To check that our answer is correct, we subtract 78 from 399.5 and subtract 399.5 from 721 and compare the two numbers:
399.5 - 78 = 321.5
721 - 399.5 = 321.5
As you can see, the halfway number is 321.5 higher than 78 and 321.5 lower than 721. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 78 and 722
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