
When you ask "What number is halfway between 0 and 663?" 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=663.

To find the number halfway between 0 and 663, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 663 into our formula, we get:
(0 + 663)/2 = 331.5
Thus, the number halfway between 0 and 663 is 331.5.
To check that our answer is correct, we subtract 0 from 331.5 and subtract 331.5 from 663 and compare the two numbers:
331.5 - 0 = 331.5
663 - 331.5 = 331.5
As you can see, the halfway number is 331.5 higher than 0 and 331.5 lower than 663. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 0 and 664
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