When you ask "What number is halfway between 9 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=9 and Y=489.
To find the number halfway between 9 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 489 into our formula, we get:
(9 + 489)/2 = 249
Thus, the number halfway between 9 and 489 is 249.
To check that our answer is correct, we subtract 9 from 249 and subtract 249 from 489 and compare the two numbers:
249 - 9 = 240
489 - 249 = 240
As you can see, the halfway number is 240 higher than 9 and 240 lower than 489. Therefore, our halfway between answer of 249 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 9 and 490
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