When you ask "What number is halfway between 25 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=25 and Y=515.
To find the number halfway between 25 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 515 into our formula, we get:
(25 + 515)/2 = 270
Thus, the number halfway between 25 and 515 is 270.
To check that our answer is correct, we subtract 25 from 270 and subtract 270 from 515 and compare the two numbers:
270 - 25 = 245
515 - 270 = 245
As you can see, the halfway number is 245 higher than 25 and 245 lower than 515. Therefore, our halfway between answer of 270 above is correct.
Halfway Between
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Halfway Between 25 and 516
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