When you ask "What number is halfway between 16 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=16 and Y=515.
To find the number halfway between 16 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 515 into our formula, we get:
(16 + 515)/2 = 265.5
Thus, the number halfway between 16 and 515 is 265.5.
To check that our answer is correct, we subtract 16 from 265.5 and subtract 265.5 from 515 and compare the two numbers:
265.5 - 16 = 249.5
515 - 265.5 = 249.5
As you can see, the halfway number is 249.5 higher than 16 and 249.5 lower than 515. Therefore, our halfway between answer of 265.5 above is correct.
Halfway Between
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Halfway Between 16 and 516
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