When you ask "What number is halfway between 84 and 515?" 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=515.
To find the number halfway between 84 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 515 into our formula, we get:
(84 + 515)/2 = 299.5
Thus, the number halfway between 84 and 515 is 299.5.
To check that our answer is correct, we subtract 84 from 299.5 and subtract 299.5 from 515 and compare the two numbers:
299.5 - 84 = 215.5
515 - 299.5 = 215.5
As you can see, the halfway number is 215.5 higher than 84 and 215.5 lower than 515. Therefore, our halfway between answer of 299.5 above is correct.
Halfway Between
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Halfway Between 84 and 516
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