
When you ask "What number is halfway between 6 and 321?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=6 and Y=321.

To find the number halfway between 6 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 321 into our formula, we get:
(6 + 321)/2 = 163.5
Thus, the number halfway between 6 and 321 is 163.5.
To check that our answer is correct, we subtract 6 from 163.5 and subtract 163.5 from 321 and compare the two numbers:
163.5 - 6 = 157.5
321 - 163.5 = 157.5
As you can see, the halfway number is 157.5 higher than 6 and 157.5 lower than 321. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 6 and 322
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