When you ask "What number is halfway between 20 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=20 and Y=511.
To find the number halfway between 20 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 511 into our formula, we get:
(20 + 511)/2 = 265.5
Thus, the number halfway between 20 and 511 is 265.5.
To check that our answer is correct, we subtract 20 from 265.5 and subtract 265.5 from 511 and compare the two numbers:
265.5 - 20 = 245.5
511 - 265.5 = 245.5
As you can see, the halfway number is 245.5 higher than 20 and 245.5 lower than 511. Therefore, our halfway between answer of 265.5 above is correct.
Halfway Between
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Halfway Between 20 and 512
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