When you ask "What number is halfway between 9 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=9 and Y=512.
To find the number halfway between 9 and 512, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 512 into our formula, we get:
(9 + 512)/2 = 260.5
Thus, the number halfway between 9 and 512 is 260.5.
To check that our answer is correct, we subtract 9 from 260.5 and subtract 260.5 from 512 and compare the two numbers:
260.5 - 9 = 251.5
512 - 260.5 = 251.5
As you can see, the halfway number is 251.5 higher than 9 and 251.5 lower than 512. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 9 and 513
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