
When you ask "What number is halfway between 25 and 421?" 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=421.

To find the number halfway between 25 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 421 into our formula, we get:
(25 + 421)/2 = 223
Thus, the number halfway between 25 and 421 is 223.
To check that our answer is correct, we subtract 25 from 223 and subtract 223 from 421 and compare the two numbers:
223 - 25 = 198
421 - 223 = 198
As you can see, the halfway number is 198 higher than 25 and 198 lower than 421. Therefore, our halfway between answer of 223 above is correct.
Halfway Between
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Halfway Between 25 and 422
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