When you ask "What number is halfway between 25 and 400?" 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=400.
To find the number halfway between 25 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 400 into our formula, we get:
(25 + 400)/2 = 212.5
Thus, the number halfway between 25 and 400 is 212.5.
To check that our answer is correct, we subtract 25 from 212.5 and subtract 212.5 from 400 and compare the two numbers:
212.5 - 25 = 187.5
400 - 212.5 = 187.5
As you can see, the halfway number is 187.5 higher than 25 and 187.5 lower than 400. Therefore, our halfway between answer of 212.5 above is correct.
Halfway Between
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Halfway Between 25 and 401
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