When you ask "What number is halfway between 25 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=25 and Y=511.
To find the number halfway between 25 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 511 into our formula, we get:
(25 + 511)/2 = 268
Thus, the number halfway between 25 and 511 is 268.
To check that our answer is correct, we subtract 25 from 268 and subtract 268 from 511 and compare the two numbers:
268 - 25 = 243
511 - 268 = 243
As you can see, the halfway number is 243 higher than 25 and 243 lower than 511. Therefore, our halfway between answer of 268 above is correct.
Halfway Between
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Halfway Between 25 and 512
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