When you ask "What number is halfway between 7 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=7 and Y=640.
To find the number halfway between 7 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 640 into our formula, we get:
(7 + 640)/2 = 323.5
Thus, the number halfway between 7 and 640 is 323.5.
To check that our answer is correct, we subtract 7 from 323.5 and subtract 323.5 from 640 and compare the two numbers:
323.5 - 7 = 316.5
640 - 323.5 = 316.5
As you can see, the halfway number is 316.5 higher than 7 and 316.5 lower than 640. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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