When you ask "What number is halfway between 7 and 820?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=820.
To find the number halfway between 7 and 820, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 820 into our formula, we get:
(7 + 820)/2 = 413.5
Thus, the number halfway between 7 and 820 is 413.5.
To check that our answer is correct, we subtract 7 from 413.5 and subtract 413.5 from 820 and compare the two numbers:
413.5 - 7 = 406.5
820 - 413.5 = 406.5
As you can see, the halfway number is 406.5 higher than 7 and 406.5 lower than 820. Therefore, our halfway between answer of 413.5 above is correct.
Halfway Between
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