When you ask "What number is halfway between 8 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=8 and Y=639.
To find the number halfway between 8 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 639 into our formula, we get:
(8 + 639)/2 = 323.5
Thus, the number halfway between 8 and 639 is 323.5.
To check that our answer is correct, we subtract 8 from 323.5 and subtract 323.5 from 639 and compare the two numbers:
323.5 - 8 = 315.5
639 - 323.5 = 315.5
As you can see, the halfway number is 315.5 higher than 8 and 315.5 lower than 639. Therefore, our halfway between answer of 323.5 above is correct.
Halfway Between
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Halfway Between 8 and 640
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