When you ask "What number is halfway between 3 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=3 and Y=639.
To find the number halfway between 3 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 639 into our formula, we get:
(3 + 639)/2 = 321
Thus, the number halfway between 3 and 639 is 321.
To check that our answer is correct, we subtract 3 from 321 and subtract 321 from 639 and compare the two numbers:
321 - 3 = 318
639 - 321 = 318
As you can see, the halfway number is 318 higher than 3 and 318 lower than 639. Therefore, our halfway between answer of 321 above is correct.
Halfway Between
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Halfway Between 3 and 640
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