When you ask "What number is halfway between 3 and 512?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=512.
To find the number halfway between 3 and 512, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 512 into our formula, we get:
(3 + 512)/2 = 257.5
Thus, the number halfway between 3 and 512 is 257.5.
To check that our answer is correct, we subtract 3 from 257.5 and subtract 257.5 from 512 and compare the two numbers:
257.5 - 3 = 254.5
512 - 257.5 = 254.5
As you can see, the halfway number is 254.5 higher than 3 and 254.5 lower than 512. Therefore, our halfway between answer of 257.5 above is correct.
Halfway Between
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Halfway Between 3 and 513
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