When you ask "What number is halfway between 21 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=21 and Y=511.
To find the number halfway between 21 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 511 into our formula, we get:
(21 + 511)/2 = 266
Thus, the number halfway between 21 and 511 is 266.
To check that our answer is correct, we subtract 21 from 266 and subtract 266 from 511 and compare the two numbers:
266 - 21 = 245
511 - 266 = 245
As you can see, the halfway number is 245 higher than 21 and 245 lower than 511. Therefore, our halfway between answer of 266 above is correct.
Halfway Between
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Halfway Between 21 and 512
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