
When you ask "What number is halfway between 84 and 529?" 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=529.

To find the number halfway between 84 and 529, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 529 into our formula, we get:
(84 + 529)/2 = 306.5
Thus, the number halfway between 84 and 529 is 306.5.
To check that our answer is correct, we subtract 84 from 306.5 and subtract 306.5 from 529 and compare the two numbers:
306.5 - 84 = 222.5
529 - 306.5 = 222.5
As you can see, the halfway number is 222.5 higher than 84 and 222.5 lower than 529. Therefore, our halfway between answer of 306.5 above is correct.
Halfway Between
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Halfway Between 84 and 530
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