When you ask "What number is halfway between 30 and 781?" 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=781.
To find the number halfway between 30 and 781, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 781 into our formula, we get:
(30 + 781)/2 = 405.5
Thus, the number halfway between 30 and 781 is 405.5.
To check that our answer is correct, we subtract 30 from 405.5 and subtract 405.5 from 781 and compare the two numbers:
405.5 - 30 = 375.5
781 - 405.5 = 375.5
As you can see, the halfway number is 375.5 higher than 30 and 375.5 lower than 781. Therefore, our halfway between answer of 405.5 above is correct.
Halfway Between
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Halfway Between 30 and 782
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