When you ask "What number is halfway between 100 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=100 and Y=511.
To find the number halfway between 100 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 511 into our formula, we get:
(100 + 511)/2 = 305.5
Thus, the number halfway between 100 and 511 is 305.5.
To check that our answer is correct, we subtract 100 from 305.5 and subtract 305.5 from 511 and compare the two numbers:
305.5 - 100 = 205.5
511 - 305.5 = 205.5
As you can see, the halfway number is 205.5 higher than 100 and 205.5 lower than 511. Therefore, our halfway between answer of 305.5 above is correct.
Halfway Between
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Halfway Between 100 and 512
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