When you ask "What number is halfway between 30 and 915?" 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=915.
To find the number halfway between 30 and 915, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 915 into our formula, we get:
(30 + 915)/2 = 472.5
Thus, the number halfway between 30 and 915 is 472.5.
To check that our answer is correct, we subtract 30 from 472.5 and subtract 472.5 from 915 and compare the two numbers:
472.5 - 30 = 442.5
915 - 472.5 = 442.5
As you can see, the halfway number is 442.5 higher than 30 and 442.5 lower than 915. Therefore, our halfway between answer of 472.5 above is correct.
Halfway Between
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Halfway Between 30 and 916
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