When you ask "What number is halfway between 25 and 644?" 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=644.
To find the number halfway between 25 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 644 into our formula, we get:
(25 + 644)/2 = 334.5
Thus, the number halfway between 25 and 644 is 334.5.
To check that our answer is correct, we subtract 25 from 334.5 and subtract 334.5 from 644 and compare the two numbers:
334.5 - 25 = 309.5
644 - 334.5 = 309.5
As you can see, the halfway number is 309.5 higher than 25 and 309.5 lower than 644. Therefore, our halfway between answer of 334.5 above is correct.
Halfway Between
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Halfway Between 25 and 645
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