When you ask "What number is halfway between 25 and 678?" 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=678.
To find the number halfway between 25 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 678 into our formula, we get:
(25 + 678)/2 = 351.5
Thus, the number halfway between 25 and 678 is 351.5.
To check that our answer is correct, we subtract 25 from 351.5 and subtract 351.5 from 678 and compare the two numbers:
351.5 - 25 = 326.5
678 - 351.5 = 326.5
As you can see, the halfway number is 326.5 higher than 25 and 326.5 lower than 678. Therefore, our halfway between answer of 351.5 above is correct.
Halfway Between
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Halfway Between 25 and 679
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