When you ask "What number is halfway between 84 and 521?" 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=521.
To find the number halfway between 84 and 521, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 521 into our formula, we get:
(84 + 521)/2 = 302.5
Thus, the number halfway between 84 and 521 is 302.5.
To check that our answer is correct, we subtract 84 from 302.5 and subtract 302.5 from 521 and compare the two numbers:
302.5 - 84 = 218.5
521 - 302.5 = 218.5
As you can see, the halfway number is 218.5 higher than 84 and 218.5 lower than 521. Therefore, our halfway between answer of 302.5 above is correct.
Halfway Between
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Halfway Between 84 and 522
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