When you ask "What number is halfway between 12 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=12 and Y=258.
To find the number halfway between 12 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 258 into our formula, we get:
(12 + 258)/2 = 135
Thus, the number halfway between 12 and 258 is 135.
To check that our answer is correct, we subtract 12 from 135 and subtract 135 from 258 and compare the two numbers:
135 - 12 = 123
258 - 135 = 123
As you can see, the halfway number is 123 higher than 12 and 123 lower than 258. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 12 and 259
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