When you ask "What number is halfway between 9 and 1000?" 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=1000.
To find the number halfway between 9 and 1000, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 1000 into our formula, we get:
(9 + 1000)/2 = 504.5
Thus, the number halfway between 9 and 1000 is 504.5.
To check that our answer is correct, we subtract 9 from 504.5 and subtract 504.5 from 1000 and compare the two numbers:
504.5 - 9 = 495.5
1000 - 504.5 = 495.5
As you can see, the halfway number is 495.5 higher than 9 and 495.5 lower than 1000. Therefore, our halfway between answer of 504.5 above is correct.
Halfway Between
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