When you ask "What number is halfway between 84 and 505?" 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=505.
To find the number halfway between 84 and 505, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 505 into our formula, we get:
(84 + 505)/2 = 294.5
Thus, the number halfway between 84 and 505 is 294.5.
To check that our answer is correct, we subtract 84 from 294.5 and subtract 294.5 from 505 and compare the two numbers:
294.5 - 84 = 210.5
505 - 294.5 = 210.5
As you can see, the halfway number is 210.5 higher than 84 and 210.5 lower than 505. Therefore, our halfway between answer of 294.5 above is correct.
Halfway Between
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Halfway Between 84 and 506
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