When you ask "What number is halfway between 25 and 390?" 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=390.
To find the number halfway between 25 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 390 into our formula, we get:
(25 + 390)/2 = 207.5
Thus, the number halfway between 25 and 390 is 207.5.
To check that our answer is correct, we subtract 25 from 207.5 and subtract 207.5 from 390 and compare the two numbers:
207.5 - 25 = 182.5
390 - 207.5 = 182.5
As you can see, the halfway number is 182.5 higher than 25 and 182.5 lower than 390. Therefore, our halfway between answer of 207.5 above is correct.
Halfway Between
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Halfway Between 25 and 391
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