When you ask "What number is halfway between 8 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=8 and Y=515.
To find the number halfway between 8 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 515 into our formula, we get:
(8 + 515)/2 = 261.5
Thus, the number halfway between 8 and 515 is 261.5.
To check that our answer is correct, we subtract 8 from 261.5 and subtract 261.5 from 515 and compare the two numbers:
261.5 - 8 = 253.5
515 - 261.5 = 253.5
As you can see, the halfway number is 253.5 higher than 8 and 253.5 lower than 515. Therefore, our halfway between answer of 261.5 above is correct.
Halfway Between
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Halfway Between 8 and 516
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