When you ask "What number is halfway between 0 and 685?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=685.
To find the number halfway between 0 and 685, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 685 into our formula, we get:
(0 + 685)/2 = 342.5
Thus, the number halfway between 0 and 685 is 342.5.
To check that our answer is correct, we subtract 0 from 342.5 and subtract 342.5 from 685 and compare the two numbers:
342.5 - 0 = 342.5
685 - 342.5 = 342.5
As you can see, the halfway number is 342.5 higher than 0 and 342.5 lower than 685. Therefore, our halfway between answer of 342.5 above is correct.
Halfway Between
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Halfway Between 0 and 686
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