When you ask "What number is halfway between 25 and 856?" 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=856.
To find the number halfway between 25 and 856, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 856 into our formula, we get:
(25 + 856)/2 = 440.5
Thus, the number halfway between 25 and 856 is 440.5.
To check that our answer is correct, we subtract 25 from 440.5 and subtract 440.5 from 856 and compare the two numbers:
440.5 - 25 = 415.5
856 - 440.5 = 415.5
As you can see, the halfway number is 415.5 higher than 25 and 415.5 lower than 856. Therefore, our halfway between answer of 440.5 above is correct.
Halfway Between
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Halfway Between 25 and 857
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