When you ask "What number is halfway between 1 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=1 and Y=640.
To find the number halfway between 1 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 640 into our formula, we get:
(1 + 640)/2 = 320.5
Thus, the number halfway between 1 and 640 is 320.5.
To check that our answer is correct, we subtract 1 from 320.5 and subtract 320.5 from 640 and compare the two numbers:
320.5 - 1 = 319.5
640 - 320.5 = 319.5
As you can see, the halfway number is 319.5 higher than 1 and 319.5 lower than 640. Therefore, our halfway between answer of 320.5 above is correct.
Halfway Between
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