When you ask "What number is halfway between 30 and 709?" 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=709.
To find the number halfway between 30 and 709, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 709 into our formula, we get:
(30 + 709)/2 = 369.5
Thus, the number halfway between 30 and 709 is 369.5.
To check that our answer is correct, we subtract 30 from 369.5 and subtract 369.5 from 709 and compare the two numbers:
369.5 - 30 = 339.5
709 - 369.5 = 339.5
As you can see, the halfway number is 339.5 higher than 30 and 339.5 lower than 709. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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Halfway Between 30 and 710
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