When you ask "What number is halfway between 30 and 771?" 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=771.
To find the number halfway between 30 and 771, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 771 into our formula, we get:
(30 + 771)/2 = 400.5
Thus, the number halfway between 30 and 771 is 400.5.
To check that our answer is correct, we subtract 30 from 400.5 and subtract 400.5 from 771 and compare the two numbers:
400.5 - 30 = 370.5
771 - 400.5 = 370.5
As you can see, the halfway number is 370.5 higher than 30 and 370.5 lower than 771. Therefore, our halfway between answer of 400.5 above is correct.
Halfway Between
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Halfway Between 30 and 772
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