When you ask "What number is halfway between 84 and 513?" 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=513.
To find the number halfway between 84 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 513 into our formula, we get:
(84 + 513)/2 = 298.5
Thus, the number halfway between 84 and 513 is 298.5.
To check that our answer is correct, we subtract 84 from 298.5 and subtract 298.5 from 513 and compare the two numbers:
298.5 - 84 = 214.5
513 - 298.5 = 214.5
As you can see, the halfway number is 214.5 higher than 84 and 214.5 lower than 513. Therefore, our halfway between answer of 298.5 above is correct.
Halfway Between
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Halfway Between 84 and 514
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