
When you ask "What number is halfway between 22 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=22 and Y=685.

To find the number halfway between 22 and 685, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 685 into our formula, we get:
(22 + 685)/2 = 353.5
Thus, the number halfway between 22 and 685 is 353.5.
To check that our answer is correct, we subtract 22 from 353.5 and subtract 353.5 from 685 and compare the two numbers:
353.5 - 22 = 331.5
685 - 353.5 = 331.5
As you can see, the halfway number is 331.5 higher than 22 and 331.5 lower than 685. Therefore, our halfway between answer of 353.5 above is correct.
Halfway Between
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Halfway Between 22 and 686
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