When you ask "What number is halfway between 25 and 251?" 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=251.
To find the number halfway between 25 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 251 into our formula, we get:
(25 + 251)/2 = 138
Thus, the number halfway between 25 and 251 is 138.
To check that our answer is correct, we subtract 25 from 138 and subtract 138 from 251 and compare the two numbers:
138 - 25 = 113
251 - 138 = 113
As you can see, the halfway number is 113 higher than 25 and 113 lower than 251. Therefore, our halfway between answer of 138 above is correct.
Halfway Between
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Halfway Between 25 and 252
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