When you ask "What number is halfway between 71 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=71 and Y=511.
To find the number halfway between 71 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 511 into our formula, we get:
(71 + 511)/2 = 291
Thus, the number halfway between 71 and 511 is 291.
To check that our answer is correct, we subtract 71 from 291 and subtract 291 from 511 and compare the two numbers:
291 - 71 = 220
511 - 291 = 220
As you can see, the halfway number is 220 higher than 71 and 220 lower than 511. Therefore, our halfway between answer of 291 above is correct.
Halfway Between
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Halfway Between 71 and 512
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