When you ask "What number is halfway between 23 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=23 and Y=258.
To find the number halfway between 23 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 258 into our formula, we get:
(23 + 258)/2 = 140.5
Thus, the number halfway between 23 and 258 is 140.5.
To check that our answer is correct, we subtract 23 from 140.5 and subtract 140.5 from 258 and compare the two numbers:
140.5 - 23 = 117.5
258 - 140.5 = 117.5
As you can see, the halfway number is 117.5 higher than 23 and 117.5 lower than 258. Therefore, our halfway between answer of 140.5 above is correct.
Halfway Between
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Halfway Between 23 and 259
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