When you ask "What number is halfway between 1 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=1 and Y=258.
To find the number halfway between 1 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 258 into our formula, we get:
(1 + 258)/2 = 129.5
Thus, the number halfway between 1 and 258 is 129.5.
To check that our answer is correct, we subtract 1 from 129.5 and subtract 129.5 from 258 and compare the two numbers:
129.5 - 1 = 128.5
258 - 129.5 = 128.5
As you can see, the halfway number is 128.5 higher than 1 and 128.5 lower than 258. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 1 and 259
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