When you ask "What number is halfway between 25 and 780?" 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=780.
To find the number halfway between 25 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 780 into our formula, we get:
(25 + 780)/2 = 402.5
Thus, the number halfway between 25 and 780 is 402.5.
To check that our answer is correct, we subtract 25 from 402.5 and subtract 402.5 from 780 and compare the two numbers:
402.5 - 25 = 377.5
780 - 402.5 = 377.5
As you can see, the halfway number is 377.5 higher than 25 and 377.5 lower than 780. Therefore, our halfway between answer of 402.5 above is correct.
Halfway Between
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