When you ask "What number is halfway between 7 and 680?" 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=680.
To find the number halfway between 7 and 680, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 680 into our formula, we get:
(7 + 680)/2 = 343.5
Thus, the number halfway between 7 and 680 is 343.5.
To check that our answer is correct, we subtract 7 from 343.5 and subtract 343.5 from 680 and compare the two numbers:
343.5 - 7 = 336.5
680 - 343.5 = 336.5
As you can see, the halfway number is 336.5 higher than 7 and 336.5 lower than 680. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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