When you ask "What number is halfway between 18 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=18 and Y=685.
To find the number halfway between 18 and 685, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 685 into our formula, we get:
(18 + 685)/2 = 351.5
Thus, the number halfway between 18 and 685 is 351.5.
To check that our answer is correct, we subtract 18 from 351.5 and subtract 351.5 from 685 and compare the two numbers:
351.5 - 18 = 333.5
685 - 351.5 = 333.5
As you can see, the halfway number is 333.5 higher than 18 and 333.5 lower than 685. Therefore, our halfway between answer of 351.5 above is correct.
Halfway Between
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Halfway Between 18 and 686
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