When you ask "What number is halfway between 20 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=20 and Y=258.
To find the number halfway between 20 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 258 into our formula, we get:
(20 + 258)/2 = 139
Thus, the number halfway between 20 and 258 is 139.
To check that our answer is correct, we subtract 20 from 139 and subtract 139 from 258 and compare the two numbers:
139 - 20 = 119
258 - 139 = 119
As you can see, the halfway number is 119 higher than 20 and 119 lower than 258. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 20 and 259
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