When you ask "What number is halfway between 16 and 511?" 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=511.
To find the number halfway between 16 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 511 into our formula, we get:
(16 + 511)/2 = 263.5
Thus, the number halfway between 16 and 511 is 263.5.
To check that our answer is correct, we subtract 16 from 263.5 and subtract 263.5 from 511 and compare the two numbers:
263.5 - 16 = 247.5
511 - 263.5 = 247.5
As you can see, the halfway number is 247.5 higher than 16 and 247.5 lower than 511. Therefore, our halfway between answer of 263.5 above is correct.
Halfway Between
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Halfway Between 16 and 512
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