When you ask "What number is halfway between 21 and 489?" 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=489.
To find the number halfway between 21 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 489 into our formula, we get:
(21 + 489)/2 = 255
Thus, the number halfway between 21 and 489 is 255.
To check that our answer is correct, we subtract 21 from 255 and subtract 255 from 489 and compare the two numbers:
255 - 21 = 234
489 - 255 = 234
As you can see, the halfway number is 234 higher than 21 and 234 lower than 489. Therefore, our halfway between answer of 255 above is correct.
Halfway Between
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Halfway Between 21 and 490
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