When you ask "What number is halfway between 8 and 643?" 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=643.
To find the number halfway between 8 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 643 into our formula, we get:
(8 + 643)/2 = 325.5
Thus, the number halfway between 8 and 643 is 325.5.
To check that our answer is correct, we subtract 8 from 325.5 and subtract 325.5 from 643 and compare the two numbers:
325.5 - 8 = 317.5
643 - 325.5 = 317.5
As you can see, the halfway number is 317.5 higher than 8 and 317.5 lower than 643. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 8 and 644
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