When you ask "What number is halfway between 25 and 646?" 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=646.
To find the number halfway between 25 and 646, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 646 into our formula, we get:
(25 + 646)/2 = 335.5
Thus, the number halfway between 25 and 646 is 335.5.
To check that our answer is correct, we subtract 25 from 335.5 and subtract 335.5 from 646 and compare the two numbers:
335.5 - 25 = 310.5
646 - 335.5 = 310.5
As you can see, the halfway number is 310.5 higher than 25 and 310.5 lower than 646. Therefore, our halfway between answer of 335.5 above is correct.
Halfway Between
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Halfway Between 25 and 647
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