When you ask "What number is halfway between 30 and 515?" 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=515.
To find the number halfway between 30 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 515 into our formula, we get:
(30 + 515)/2 = 272.5
Thus, the number halfway between 30 and 515 is 272.5.
To check that our answer is correct, we subtract 30 from 272.5 and subtract 272.5 from 515 and compare the two numbers:
272.5 - 30 = 242.5
515 - 272.5 = 242.5
As you can see, the halfway number is 242.5 higher than 30 and 242.5 lower than 515. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 30 and 516
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