
When you ask "What number is halfway between 25 and 153?" 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=153.

To find the number halfway between 25 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 153 into our formula, we get:
(25 + 153)/2 = 89
Thus, the number halfway between 25 and 153 is 89.
To check that our answer is correct, we subtract 25 from 89 and subtract 89 from 153 and compare the two numbers:
89 - 25 = 64
153 - 89 = 64
As you can see, the halfway number is 64 higher than 25 and 64 lower than 153. Therefore, our halfway between answer of 89 above is correct.
Halfway Between
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Halfway Between 25 and 154
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