When you ask "What number is halfway between 25 and 690?" 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=690.
To find the number halfway between 25 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 690 into our formula, we get:
(25 + 690)/2 = 357.5
Thus, the number halfway between 25 and 690 is 357.5.
To check that our answer is correct, we subtract 25 from 357.5 and subtract 357.5 from 690 and compare the two numbers:
357.5 - 25 = 332.5
690 - 357.5 = 332.5
As you can see, the halfway number is 332.5 higher than 25 and 332.5 lower than 690. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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Halfway Between 25 and 691
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