When you ask "What number is halfway between 11 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=11 and Y=258.
To find the number halfway between 11 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 258 into our formula, we get:
(11 + 258)/2 = 134.5
Thus, the number halfway between 11 and 258 is 134.5.
To check that our answer is correct, we subtract 11 from 134.5 and subtract 134.5 from 258 and compare the two numbers:
134.5 - 11 = 123.5
258 - 134.5 = 123.5
As you can see, the halfway number is 123.5 higher than 11 and 123.5 lower than 258. Therefore, our halfway between answer of 134.5 above is correct.
Halfway Between
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Halfway Between 11 and 259
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