When you ask "What number is halfway between 18 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=18 and Y=258.
To find the number halfway between 18 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 258 into our formula, we get:
(18 + 258)/2 = 138
Thus, the number halfway between 18 and 258 is 138.
To check that our answer is correct, we subtract 18 from 138 and subtract 138 from 258 and compare the two numbers:
138 - 18 = 120
258 - 138 = 120
As you can see, the halfway number is 120 higher than 18 and 120 lower than 258. Therefore, our halfway between answer of 138 above is correct.
Halfway Between
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Halfway Between 18 and 259
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