When you ask "What number is halfway between 17 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=17 and Y=684.
To find the number halfway between 17 and 684, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 684 into our formula, we get:
(17 + 684)/2 = 350.5
Thus, the number halfway between 17 and 684 is 350.5.
To check that our answer is correct, we subtract 17 from 350.5 and subtract 350.5 from 684 and compare the two numbers:
350.5 - 17 = 333.5
684 - 350.5 = 333.5
As you can see, the halfway number is 333.5 higher than 17 and 333.5 lower than 684. Therefore, our halfway between answer of 350.5 above is correct.
Halfway Between
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Halfway Between 17 and 685
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