When you ask "What number is halfway between 25 and 556?" 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=556.
To find the number halfway between 25 and 556, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 556 into our formula, we get:
(25 + 556)/2 = 290.5
Thus, the number halfway between 25 and 556 is 290.5.
To check that our answer is correct, we subtract 25 from 290.5 and subtract 290.5 from 556 and compare the two numbers:
290.5 - 25 = 265.5
556 - 290.5 = 265.5
As you can see, the halfway number is 265.5 higher than 25 and 265.5 lower than 556. Therefore, our halfway between answer of 290.5 above is correct.
Halfway Between
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Halfway Between 25 and 557
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