When you ask "What number is halfway between 84 and 520?" 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=520.
To find the number halfway between 84 and 520, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 520 into our formula, we get:
(84 + 520)/2 = 302
Thus, the number halfway between 84 and 520 is 302.
To check that our answer is correct, we subtract 84 from 302 and subtract 302 from 520 and compare the two numbers:
302 - 84 = 218
520 - 302 = 218
As you can see, the halfway number is 218 higher than 84 and 218 lower than 520. Therefore, our halfway between answer of 302 above is correct.
Halfway Between
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Halfway Between 84 and 521
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