When you ask "What number is halfway between 11 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=11 and Y=489.
To find the number halfway between 11 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 489 into our formula, we get:
(11 + 489)/2 = 250
Thus, the number halfway between 11 and 489 is 250.
To check that our answer is correct, we subtract 11 from 250 and subtract 250 from 489 and compare the two numbers:
250 - 11 = 239
489 - 250 = 239
As you can see, the halfway number is 239 higher than 11 and 239 lower than 489. Therefore, our halfway between answer of 250 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 11 and 490
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