When you ask "What number is halfway between 25 and 129?" 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=129.
To find the number halfway between 25 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 129 into our formula, we get:
(25 + 129)/2 = 77
Thus, the number halfway between 25 and 129 is 77.
To check that our answer is correct, we subtract 25 from 77 and subtract 77 from 129 and compare the two numbers:
77 - 25 = 52
129 - 77 = 52
As you can see, the halfway number is 52 higher than 25 and 52 lower than 129. Therefore, our halfway between answer of 77 above is correct.
Halfway Between
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Halfway Between 25 and 130
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