When you ask "What number is halfway between 7 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=7 and Y=684.
To find the number halfway between 7 and 684, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 684 into our formula, we get:
(7 + 684)/2 = 345.5
Thus, the number halfway between 7 and 684 is 345.5.
To check that our answer is correct, we subtract 7 from 345.5 and subtract 345.5 from 684 and compare the two numbers:
345.5 - 7 = 338.5
684 - 345.5 = 338.5
As you can see, the halfway number is 338.5 higher than 7 and 338.5 lower than 684. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 7 and 685
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