When you ask "What number is halfway between 6 and 821?" 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=821.
To find the number halfway between 6 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 821 into our formula, we get:
(6 + 821)/2 = 413.5
Thus, the number halfway between 6 and 821 is 413.5.
To check that our answer is correct, we subtract 6 from 413.5 and subtract 413.5 from 821 and compare the two numbers:
413.5 - 6 = 407.5
821 - 413.5 = 407.5
As you can see, the halfway number is 407.5 higher than 6 and 407.5 lower than 821. Therefore, our halfway between answer of 413.5 above is correct.
Halfway Between
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Halfway Between 6 and 822
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