When you ask "What number is halfway between 25 and 686?" 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=686.
To find the number halfway between 25 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 686 into our formula, we get:
(25 + 686)/2 = 355.5
Thus, the number halfway between 25 and 686 is 355.5.
To check that our answer is correct, we subtract 25 from 355.5 and subtract 355.5 from 686 and compare the two numbers:
355.5 - 25 = 330.5
686 - 355.5 = 330.5
As you can see, the halfway number is 330.5 higher than 25 and 330.5 lower than 686. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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Halfway Between 25 and 687
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