When you ask "What number is halfway between 87 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=87 and Y=511.
To find the number halfway between 87 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 511 into our formula, we get:
(87 + 511)/2 = 299
Thus, the number halfway between 87 and 511 is 299.
To check that our answer is correct, we subtract 87 from 299 and subtract 299 from 511 and compare the two numbers:
299 - 87 = 212
511 - 299 = 212
As you can see, the halfway number is 212 higher than 87 and 212 lower than 511. Therefore, our halfway between answer of 299 above is correct.
Halfway Between
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Halfway Between 87 and 512
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