When you ask "What number is halfway between 13 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=13 and Y=258.
To find the number halfway between 13 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 258 into our formula, we get:
(13 + 258)/2 = 135.5
Thus, the number halfway between 13 and 258 is 135.5.
To check that our answer is correct, we subtract 13 from 135.5 and subtract 135.5 from 258 and compare the two numbers:
135.5 - 13 = 122.5
258 - 135.5 = 122.5
As you can see, the halfway number is 122.5 higher than 13 and 122.5 lower than 258. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 13 and 259
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