When you ask "What number is halfway between 0 and 639?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=639.
To find the number halfway between 0 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 639 into our formula, we get:
(0 + 639)/2 = 319.5
Thus, the number halfway between 0 and 639 is 319.5.
To check that our answer is correct, we subtract 0 from 319.5 and subtract 319.5 from 639 and compare the two numbers:
319.5 - 0 = 319.5
639 - 319.5 = 319.5
As you can see, the halfway number is 319.5 higher than 0 and 319.5 lower than 639. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 0 and 640
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