When you ask "What number is halfway between 10 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=10 and Y=489.
To find the number halfway between 10 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 489 into our formula, we get:
(10 + 489)/2 = 249.5
Thus, the number halfway between 10 and 489 is 249.5.
To check that our answer is correct, we subtract 10 from 249.5 and subtract 249.5 from 489 and compare the two numbers:
249.5 - 10 = 239.5
489 - 249.5 = 239.5
As you can see, the halfway number is 239.5 higher than 10 and 239.5 lower than 489. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 10 and 490
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