When you ask "What number is halfway between 84 and 487?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=487.
To find the number halfway between 84 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 487 into our formula, we get:
(84 + 487)/2 = 285.5
Thus, the number halfway between 84 and 487 is 285.5.
To check that our answer is correct, we subtract 84 from 285.5 and subtract 285.5 from 487 and compare the two numbers:
285.5 - 84 = 201.5
487 - 285.5 = 201.5
As you can see, the halfway number is 201.5 higher than 84 and 201.5 lower than 487. Therefore, our halfway between answer of 285.5 above is correct.
Halfway Between
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Halfway Between 84 and 488
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