When you ask "What number is halfway between 9 and 640?" 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=640.
To find the number halfway between 9 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 640 into our formula, we get:
(9 + 640)/2 = 324.5
Thus, the number halfway between 9 and 640 is 324.5.
To check that our answer is correct, we subtract 9 from 324.5 and subtract 324.5 from 640 and compare the two numbers:
324.5 - 9 = 315.5
640 - 324.5 = 315.5
As you can see, the halfway number is 315.5 higher than 9 and 315.5 lower than 640. Therefore, our halfway between answer of 324.5 above is correct.
Halfway Between
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