When you ask "What number is halfway between 84 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=84 and Y=511.
To find the number halfway between 84 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 511 into our formula, we get:
(84 + 511)/2 = 297.5
Thus, the number halfway between 84 and 511 is 297.5.
To check that our answer is correct, we subtract 84 from 297.5 and subtract 297.5 from 511 and compare the two numbers:
297.5 - 84 = 213.5
511 - 297.5 = 213.5
As you can see, the halfway number is 213.5 higher than 84 and 213.5 lower than 511. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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Halfway Between 84 and 512
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