When you ask "What number is halfway between 78 and 519?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=519.
To find the number halfway between 78 and 519, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 519 into our formula, we get:
(78 + 519)/2 = 298.5
Thus, the number halfway between 78 and 519 is 298.5.
To check that our answer is correct, we subtract 78 from 298.5 and subtract 298.5 from 519 and compare the two numbers:
298.5 - 78 = 220.5
519 - 298.5 = 220.5
As you can see, the halfway number is 220.5 higher than 78 and 220.5 lower than 519. Therefore, our halfway between answer of 298.5 above is correct.
Halfway Between
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Halfway Between 78 and 520
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