When you ask "What number is halfway between 30 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=30 and Y=639.
To find the number halfway between 30 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 639 into our formula, we get:
(30 + 639)/2 = 334.5
Thus, the number halfway between 30 and 639 is 334.5.
To check that our answer is correct, we subtract 30 from 334.5 and subtract 334.5 from 639 and compare the two numbers:
334.5 - 30 = 304.5
639 - 334.5 = 304.5
As you can see, the halfway number is 304.5 higher than 30 and 304.5 lower than 639. Therefore, our halfway between answer of 334.5 above is correct.
Halfway Between
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Halfway Between 30 and 640
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