When you ask "What number is halfway between 25 and 778?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=25 and Y=778.
To find the number halfway between 25 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 778 into our formula, we get:
(25 + 778)/2 = 401.5
Thus, the number halfway between 25 and 778 is 401.5.
To check that our answer is correct, we subtract 25 from 401.5 and subtract 401.5 from 778 and compare the two numbers:
401.5 - 25 = 376.5
778 - 401.5 = 376.5
As you can see, the halfway number is 376.5 higher than 25 and 376.5 lower than 778. Therefore, our halfway between answer of 401.5 above is correct.
Halfway Between
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Halfway Between 25 and 779
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