When you ask "What number is halfway between 9 and 490?" 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=490.
To find the number halfway between 9 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 490 into our formula, we get:
(9 + 490)/2 = 249.5
Thus, the number halfway between 9 and 490 is 249.5.
To check that our answer is correct, we subtract 9 from 249.5 and subtract 249.5 from 490 and compare the two numbers:
249.5 - 9 = 240.5
490 - 249.5 = 240.5
As you can see, the halfway number is 240.5 higher than 9 and 240.5 lower than 490. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 9 and 491
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