When you ask "What number is halfway between 10 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=10 and Y=511.
To find the number halfway between 10 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 511 into our formula, we get:
(10 + 511)/2 = 260.5
Thus, the number halfway between 10 and 511 is 260.5.
To check that our answer is correct, we subtract 10 from 260.5 and subtract 260.5 from 511 and compare the two numbers:
260.5 - 10 = 250.5
511 - 260.5 = 250.5
As you can see, the halfway number is 250.5 higher than 10 and 250.5 lower than 511. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 10 and 512
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