When you ask "What number is halfway between 7 and 686?" 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=686.
To find the number halfway between 7 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 686 into our formula, we get:
(7 + 686)/2 = 346.5
Thus, the number halfway between 7 and 686 is 346.5.
To check that our answer is correct, we subtract 7 from 346.5 and subtract 346.5 from 686 and compare the two numbers:
346.5 - 7 = 339.5
686 - 346.5 = 339.5
As you can see, the halfway number is 339.5 higher than 7 and 339.5 lower than 686. Therefore, our halfway between answer of 346.5 above is correct.
Halfway Between
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Halfway Between 7 and 687
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