
When you ask "What number is halfway between 25 and 669?" 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=669.

To find the number halfway between 25 and 669, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 669 into our formula, we get:
(25 + 669)/2 = 347
Thus, the number halfway between 25 and 669 is 347.
To check that our answer is correct, we subtract 25 from 347 and subtract 347 from 669 and compare the two numbers:
347 - 25 = 322
669 - 347 = 322
As you can see, the halfway number is 322 higher than 25 and 322 lower than 669. Therefore, our halfway between answer of 347 above is correct.
Halfway Between
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Halfway Between 25 and 670
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