When you ask "What number is halfway between 42 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=42 and Y=511.
To find the number halfway between 42 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 511 into our formula, we get:
(42 + 511)/2 = 276.5
Thus, the number halfway between 42 and 511 is 276.5.
To check that our answer is correct, we subtract 42 from 276.5 and subtract 276.5 from 511 and compare the two numbers:
276.5 - 42 = 234.5
511 - 276.5 = 234.5
As you can see, the halfway number is 234.5 higher than 42 and 234.5 lower than 511. Therefore, our halfway between answer of 276.5 above is correct.
Halfway Between
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Halfway Between 42 and 512
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