When you ask "What number is halfway between 25 and 831?" 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=831.
To find the number halfway between 25 and 831, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 831 into our formula, we get:
(25 + 831)/2 = 428
Thus, the number halfway between 25 and 831 is 428.
To check that our answer is correct, we subtract 25 from 428 and subtract 428 from 831 and compare the two numbers:
428 - 25 = 403
831 - 428 = 403
As you can see, the halfway number is 403 higher than 25 and 403 lower than 831. Therefore, our halfway between answer of 428 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 25 and 832
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