When you ask "What number is halfway between 12 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=12 and Y=639.
To find the number halfway between 12 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 639 into our formula, we get:
(12 + 639)/2 = 325.5
Thus, the number halfway between 12 and 639 is 325.5.
To check that our answer is correct, we subtract 12 from 325.5 and subtract 325.5 from 639 and compare the two numbers:
325.5 - 12 = 313.5
639 - 325.5 = 313.5
As you can see, the halfway number is 313.5 higher than 12 and 313.5 lower than 639. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 12 and 640
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