When you ask "What number is halfway between 3 and 684?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=684.
To find the number halfway between 3 and 684, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 684 into our formula, we get:
(3 + 684)/2 = 343.5
Thus, the number halfway between 3 and 684 is 343.5.
To check that our answer is correct, we subtract 3 from 343.5 and subtract 343.5 from 684 and compare the two numbers:
343.5 - 3 = 340.5
684 - 343.5 = 340.5
As you can see, the halfway number is 340.5 higher than 3 and 340.5 lower than 684. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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Halfway Between 3 and 685
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