When you ask "What number is halfway between 21 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=21 and Y=258.
To find the number halfway between 21 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 258 into our formula, we get:
(21 + 258)/2 = 139.5
Thus, the number halfway between 21 and 258 is 139.5.
To check that our answer is correct, we subtract 21 from 139.5 and subtract 139.5 from 258 and compare the two numbers:
139.5 - 21 = 118.5
258 - 139.5 = 118.5
As you can see, the halfway number is 118.5 higher than 21 and 118.5 lower than 258. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 21 and 259
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