When you ask "What number is halfway between 25 and 258?" 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=258.
To find the number halfway between 25 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 258 into our formula, we get:
(25 + 258)/2 = 141.5
Thus, the number halfway between 25 and 258 is 141.5.
To check that our answer is correct, we subtract 25 from 141.5 and subtract 141.5 from 258 and compare the two numbers:
141.5 - 25 = 116.5
258 - 141.5 = 116.5
As you can see, the halfway number is 116.5 higher than 25 and 116.5 lower than 258. Therefore, our halfway between answer of 141.5 above is correct.
Halfway Between
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Halfway Between 25 and 259
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