When you ask "What number is halfway between 5 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=5 and Y=258.
To find the number halfway between 5 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 258 into our formula, we get:
(5 + 258)/2 = 131.5
Thus, the number halfway between 5 and 258 is 131.5.
To check that our answer is correct, we subtract 5 from 131.5 and subtract 131.5 from 258 and compare the two numbers:
131.5 - 5 = 126.5
258 - 131.5 = 126.5
As you can see, the halfway number is 126.5 higher than 5 and 126.5 lower than 258. Therefore, our halfway between answer of 131.5 above is correct.
Halfway Between
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Halfway Between 5 and 259
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