
When you ask "What number is halfway between 25 and 253?" 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=253.

To find the number halfway between 25 and 253, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 253 into our formula, we get:
(25 + 253)/2 = 139
Thus, the number halfway between 25 and 253 is 139.
To check that our answer is correct, we subtract 25 from 139 and subtract 139 from 253 and compare the two numbers:
139 - 25 = 114
253 - 139 = 114
As you can see, the halfway number is 114 higher than 25 and 114 lower than 253. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 25 and 254
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