When you ask "What number is halfway between 87 and 580?" 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=580.
To find the number halfway between 87 and 580, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 580 into our formula, we get:
(87 + 580)/2 = 333.5
Thus, the number halfway between 87 and 580 is 333.5.
To check that our answer is correct, we subtract 87 from 333.5 and subtract 333.5 from 580 and compare the two numbers:
333.5 - 87 = 246.5
580 - 333.5 = 246.5
As you can see, the halfway number is 246.5 higher than 87 and 246.5 lower than 580. Therefore, our halfway between answer of 333.5 above is correct.
Halfway Between
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Halfway Between 87 and 581
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