
When you ask "What number is halfway between 8 and 648?" 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=648.

To find the number halfway between 8 and 648, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 648 into our formula, we get:
(8 + 648)/2 = 328
Thus, the number halfway between 8 and 648 is 328.
To check that our answer is correct, we subtract 8 from 328 and subtract 328 from 648 and compare the two numbers:
328 - 8 = 320
648 - 328 = 320
As you can see, the halfway number is 320 higher than 8 and 320 lower than 648. Therefore, our halfway between answer of 328 above is correct.
Halfway Between
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Halfway Between 8 and 649
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