When you ask "What number is halfway between 78 and 725?" 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=725.
To find the number halfway between 78 and 725, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 725 into our formula, we get:
(78 + 725)/2 = 401.5
Thus, the number halfway between 78 and 725 is 401.5.
To check that our answer is correct, we subtract 78 from 401.5 and subtract 401.5 from 725 and compare the two numbers:
401.5 - 78 = 323.5
725 - 401.5 = 323.5
As you can see, the halfway number is 323.5 higher than 78 and 323.5 lower than 725. Therefore, our halfway between answer of 401.5 above is correct.
Halfway Between
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Halfway Between 78 and 726
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